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A Review of Arsenic Poisoning and its Effects on Human Health



The incidence of arsenic contamination of ground water used for both irrigation as well as for human consumption or industrial activities has taken the dimension of an epidemiological problem. It has been established that inorganic arsenic is extremely toxic, both acute and chronic. Initially, it enters into the human body through ingestion, inhalation, or skin absorption. After entering into the body it is distributed in a large number of organs, including the lungs, liver, kidney, and skin. The clinical manifestations of arsenic poisoning are myriad, and the correct diagnosis depends largely on awareness of the problem. It is very difficult to diagnose early symptoms of arsenicosis because such nonspecific symptoms may also be present in many other diseases. Medicine used for the remedy of arsenicosis has been found to be unsatisfactory by repeated application and experience. Melanosis may disappear but keratosis is not altered, although it can prevent further complication. Once the complication (malignancy) has developed using medicine may not prevent it. The symptoms and signs of arsenic poisoning may be reduced if the quality of drinking water was improved. Arsenic-free water or a decrease in the arsenic level in the drinking water source is essential for overall development.
J. C. Saha
, A. K. Dikshit
and M. Bandyopadhyay
Research Scholar,
Assistant Professor,
Department of Civil Engineering
Indian Institute of Technology, Kharagpur-721302, India
K. C. Saha
Professor and Head
Department of Dermatology (Retd.)
School of Tropical Medicine, Calcutta, India
ABSTRACT: The incidence of arsenic contamination of ground water used for both irrigation as well as
for human consumption or industrial activities has taken the dimension of an epidemiological problem. It has
been established that inorganic arsenic is extremely toxic both acute and chronic. Initially it enters into the
human body through ingestion, inhalation, or skin absorption. After entering into the body it is distributed in
a large number of organs including the lungs, liver, kidney and skin. The clinical manifestations of arsenic
poisoning are myriad, and the correct diagnosis depends largely on awareness of the problem. It is very
difficult to diagnose early symptoms of arsenicosis because such non-specific symptoms may also be
present in many other diseases. Medicine used for remedy of arsenicosis has been found to be
unsatisfactory by repeated application and experience. Melanosis may disappear but keratosis is not
altered; though it can prevent further complication. Once the
Address correspondence to Dr. K. C. Saha, EC-21, Sector 1, Salt Lake, Calcutta-700064, India
complication (malignancy) has developed, using medicine may not prevent it. The symptoms and
signs of arsenic poisoning may be reduced if the quality of drinking water were improved. Arsenic free
water or decrease in arsenic level in the drinking water source is essential for overall development.
KEY WORDS: Arsenicosis, acute toxicity, chronic toxicity, melanosis, keratosis, cancer, ground water,
Arsenic is an element that raises much concern from the both environmental and human health
standpoints. Humans may encounter arsenic in water from wells drilled into arsenic-rich ground strata or in
water contaminated by industrial or agrochemical waste.
They may come in contact with arsenic in
contaminated dusts, fumes, or mists. They may eat food contaminated with arsenical pesticides or grown
with arsenic-contaminated water or in arsenic-rich soil.
In experience of one of us (KCS) food grown in
arsenic affected areas arsenic is not found inside the food like cereals, pulses, fruits, but may be found in
external layer of food or fruits due to spreneld of arsenicated water. Similarly milk of arsenic affected cows
is free from arsenic due to modification inside body or some barrier action of unknown mechanism. A few
stray reports of arsenic in cow’s milk are most likely due to adulteration of milk by arsenicated water.
This element has long been associated with criminal activity and still is an emotionally highly charged
topic, as large homicidal doses can cause cholera like symptoms (acute poisoning) and death. Ingestion of
low dose via food or water is the main pathway of this metalloid into the organism, where absorption takes
place in the stomach and intestines, followed by release into the bloodstream. In chronic poisoning, arsenic
is then converted by the liver to a less toxic form, from where it is eventually largely excreted in the urine.
Only very high exposure can, in fact, lead to appreciable accumulation in the body. Minor alternative
pathways of entry are known through inhalation and dermal exposure.
Arsenic is a protoplastic poison due to its effect on sulphydryl group of cells interfering with cells
enzymes, cell respiration and mitosis.
Chronic arsenical poisoning and medicinal use of arsenic are known
since long. Arsenic was used orally as Fowler's solution in tonic mixtures and in the treatment of asthma,
leukaemia and other malignancies.
73, 141
Parenterally arsenic was used in the past for the treatment of
, topical eosinophilia
, trepanosomiasis
84, 88
, Lichen planus, verruca planum and psoriasis.
Domestic, agricultural and industrial uses of arsenic
in the form of insecticides, weedicides, rodenticides
and arsine are becoming rarer because of advent of low toxic pesticides. Chronic hepatitis and hepatic
cirrhosis have been described due to consuming arsenic contaminated beer.
108, 138
features of chronic arsenical poisoning by consuming arsenic contaminated drinking water were first
reported in 1961 by Tseng et al., in Taiwan
, followed by Rosenberg
at Chile by Datta in India
Saha's report
is the first report in world literature of chronic arsenical dermatosis from consuming arsenic
contaminated tube well water.
Nowadays, it is generally acknowledged that different species of an element can exert diverse
toxicological and biological effects in animal and human system.
This obviously also applies to compounds
whose toxicity greatly varies. The inorganic forms of arsenic exhibit the highest toxicity level
, while
organoarsenicals are usually less toxic than the inorganic arsenic species. Indeed, some organic arsenic
compounds, such as arsenobetaine (AsBet) and arsenocholine (AsChol), are well tolerated by living
. From this point of view, it is becoming increasingly important that the various forms of
arsenic be qualitatively and quantitatively determined in biological fluids and tissue as well as in matrices of
nutritional and environmental relevance, especially in marine ecosystem. This will allow for a much better
assessment of the risk associated with exposure to arsenic compounds.
Legal provisions are at present almost exclusively concerned with the total amount of the element in
foodstuff and drinking water. According to the World Health Organisation (WHO), the provisional total
daily intake should not exceed 2 ?g of inorganic arsenic per kilogram of body weight. Marine organisms are
considered to be among the greatest bioaccumulators of arsenic due to given the tendency shown by this
element to replace N or P in several compounds, thus producing AsBet, AsChol, algal arsenosugars etc.,
but they are harmless to the system.
Exposure to arsenic may come from natural source, from industrial source, or from administered
i.e., accidental source. Self-administration of arsenic, unintentionally i.e., accidental consumption by children
or deliberate i.e., homicidal or suicidal in attempts by adults, represents the rare causes of acute poisoning
The source of such self-administration is typically an arsenic-containing insecticide, herbicide, or rodenticide.
From a clinical perspective, massive exposures are now not usually seen in suicidal or homicidal setting;
accidental exposures, usually not serious yet largely preventable, are usually seen in children, and chronic or
intermittent exposures often are the most diagnostically challenging. Exposure to arsenic via drinking water,
air, food, and beverage has been reported occurring at many places in the world. Exposure through drinking
water is increasing due to contamination from industrial operation and over withdrawal of groundwater for
Occupational and environmental health problems can result from the frequent commercial presence
of arsenicals. Exposure to arsine gas is also an environmental health hazard of concern in numerous
occupational circumstances. Arsine is a colourless, odourless, tasteless, nonirritating gas that causes a rapid
and unique destruction of red blood cells and may result in kidney failure, which is uniformly fatal without
proper therapy. Most cases of arsine poisoning have occurred with the use of acids and crude metals of
which one or both contained arsenic as an impurity.
The two usual routes of absorption of arsenic are by ingestion and/or inhalation. There may be some
degree of skin absorption of trivalent arsenic oxide since it is more lipid-soluble than the pentavalent form.
If the contact is by ingestion, then symptoms caused by acute gastrointestinal irritation will dominate the
reaction. Ingested arsenic has a shorter half-life than inhaled arsenic due to more rapid biotransformation in
the liver.
If the inhalation is the route of initial contact, then respiratory irritation will be a major
determinant of early symptoms. However, once the arsenic is absorbed, the vascular circulation will ensue
contact with a wide variety of potential symptoms reflecting the diversity of possible organ damages.
Arsenic enters the human body through ingestion, inhalation, or skin absorption. Most ingested and
inhalated arsenic is well absorbed through the gastrointestinal tract and lung into the blood stream. 95
percent of the ingested trivalent arsenic is absorbed from the gastrointestinal tract. It is distributed in a large
number of organs including the lungs, liver, kidney, and skin.
After absorption through lungs and the
gastro-intestinal tract, 95 to 99 % of the arsenic is located in erythrocytes, bound to the globin of
hemoglobin and is then transported to the other parts of the body. About 70% of the arsenic are excreted
mainly through urine. Most arsenic absorbed into the body is converted by the liver to less toxic methylated
form that is efficiently excreted in the urine. The rate of decrease of arsenic in the skin appears to be
specially low compared with the rate for other organs.
A. Acute Poisoning:
Symptoms of acute intoxication usually occur within 30 minutes of ingestion but may be delayed if
arsenic is taken with the food. Initially, a patient may have a metallic taste or notice a slight garlicky odor to
the breath associated with a dry mouth and difficulty in swallowing. Early clinical symptoms at acute arsenic
intoxication may be muscular pain, weakness with flusking skin. Severe nausea and vomiting, colicky
abdominal pain, and profuse diarrhoea with rice-water stools abruptly ensure. Capillary damage leads to
generalized vasodilation, transudation of plasma, and vasagenice shock. Arsenic's effect on the mucosal
vascular supply, not a direct corrosive action, leads to transudation of fluid in the bowel lumen, mucosal
vesical formation, and sloughing of tissue fragments. The patient may complain of muscle cramps, numbness
in hands and feet, reddish rashes in the body and intense thirst. In severe poisoning, the skin becomes cold
and clammy, and some degree of circulatory collapse usually occurs along with kidney damage and
decreased urine output. Drowsiness and confusion are often seen along with the development of a psychosis
associated with paranoid delusions, hallucinations, and delirium. Finally, seizures, coma, and death, usually
due to shock, may ensue.
Following the gastrointestinal phase, multisystem organ damage may occur. If death does not occur
in the first 24 hrs. from irreversible circulatory insufficiency, it may result from hepatic or renal failure over
the next several days. Cardiac manifestations include acute cardiomyopathy, subendocardial haemorrhages,
and electrocardiographic changes. The most common changes on an electrocardiogram are prolonged QT
intervals and non-specific ST-segment changes.
B. Chronic Poisoning:
Chronic arsenic poisoning is much more insidious in nature, often involving multiple hospital
admissions before the correct diagnosis is made. Arsenical dermatosis was rarely picked up from the variety
of so many dermatosis. The source of arsenic exposure is discovered in fewer than 50% of cases. The most
prominent chronic manifestations involve the skin, lungs, liver and blood systems. This was first diagnosed in
West Bengal and Bangladesh patient of Khulna in December, 1984
113, 114
by Prof. K. C. Saha in July 1982
at School of Tropical Medicine, Calcutta.
112, 113
The cutaneous changes are characteristic yet non-specific. An initial persistent erythematous flush
slowly, over time, leads to melanosis, hyperkeratosis, and desquamation. The skin pigmentation is patchy
and has been given the poetic description of "raindrops on a dusty road". The hyperkeratosis is frequently
punctuate and occurs on the distal extremities. A diffuse desquamation of the palms and soles is also seen.
Long-term cutaneous complications include the development of multicentric basal cell and squamous cell
One of us (KCS) found mostly squamous cell carcinoma and Bowen's disease both
monocentric and multicentric but Basal cell carcinoma was not found in skin out of 222 malignancies in
113, 114
Bowen's disease, a rare precancerous skin lesion, is associated with both arsenic and
human papilloma virus (HPV). Both arsenic and HPV cause cancer of the epithelial tissue
, and one may
speculate that arsenic cause cancer in human beings through the activation of an oncogenic virus like HPV.
This would explain why arsenic promotes cancer of the epithelial tissue in human beings but not in rodents,
which normally do not carry papilloma virus.
Brittle nail, patchy alopecia, and facial edema are reported
in the literature in arsenical skin diseases. One of us KCS
experienced non-pitting oedema of feet and
rarely conjunctival congestion as additional signs in arsenical dermatosis (ASD).
Anaemia and leukopenia are almost universal with chronic arsenic exposure. Thrombocytopenia
also frequently occurs. The anaemia is usually normochromic and normocytic and caused at least partially by
Interference with folate metabolism and DNA synthesis may result in megaloblastic
In underdeveloped countries like India and Bangladesh, the presence of anaemia, leucopenia
and thrombo cytopenia from arsenic are to be carefully assessed keeping in mind the common association of
anaemia and leucopenia from malnutrition.
Clinical Symptoms:
Clinical symptoms occurring in the early stage of human arsenic poisoning were unspecific. The
clinical manifestations of arsenic poisoning are myriad, and the correct diagnosis depends largely on
awareness of the problem. Among the people who were taking high-arsenic water, early symptoms
included, following non-specific symptoms, which can be present in many other diseases.
?? Palpitations
?? Fatigue
?? Headache, dizziness, insomnia, weakness
?? Nightmare
?? Numbness in the extremities, anaemia
Stages of Clinical Features of Arsenic Toxicity
Arsenical toxicity or arsenicosis develops insidiously after six months to two years or more
depending on the amount of intake of arsenic laden ground water and arsenic concentration in the water.
The higher the concentration above the maximum permissible level (0.05 mg/L) or higher the amount of daily
water intake, the earlier the onset of symptoms.
The features of arsenical toxicity has been classified by Dr. Saha
which are now known as Saha's
classification of stages. These are (1) Preclinical, (2) Clinical, (3) Internal complication and (4) Malignancy.
1. Pre-Clinical (asymptomatic) Stage: This may be subdivided into (a) Labile, chemical or blood phase
(transient). Urine showing arsenic metabolites, Dimethylarsonic acid (DMAA) and Trimethl arsinic acid
(TMAA) , during intake of groundwater containing high arsenic concentration; (b) Stable, sub-clinical or
occult phase or tissue phase (persistent). Body tissue showing high arsenic concentrations with no
apparent clinical symptoms. Blood phase (Labile): After the intake of arsenic contaminated water, blood
and urine examination reveals arsenic products but on withdrawal of it, urine becomes free of arsenic. The
nature of arsenic revealed in urine is dimethyl arsonic acid (DMAA) and trimethyl arsinic acid (TMAA).
Tissue phase (stable): In this phase, examination of nails, hair and skin scales or other body tissues reveals
high arsenic concentration, though the features of arsenic toxicity are absent. Unaffected members of an
affected family often are in this stage.
2. Clinical Stage (symptomatic or overt phase): The presence of clinical symptoms is confirmed by
detection of higher arsenic concentration in nail, hair and skin scales. Idea of skin scales for arsenic was also
first observed by Prof. Saha.
Onset: The features of arsenical toxicity appear gradually and slowly with time. Six month to ten years
(average 2 years) may be required for the development of clinical features. If the arsenic concentration in
water consumed is not very high or the daily water intake is low or if the patient spends most of the day in
other unaffected areas for business or service or if the nutritional status of the patient is good, the clinical
features may not developed for years and if it develops at all, the sign are often mild. On the other hand if
these conditions are not satisfied, the symptoms may develop between 6 months to 2 years.
Major Dermatological Signs:
(i) Melano-keratosis: Melanosis i.e., dark pigmentation-diffuse and/or spotted keratosis i.e., dry, rough
spotted nodules in palms and/or soles are the chief symptoms of arsenical dermatosis (ASD). It should be
noted that there are various causes of melanosis and keratosis, spotted and diffuse, genetic and acquired.
The combination of the two features-melanosis and keratosis-in the same patient in adults points to the
diagnosis of arsenical dermatosis. Genetic disorders are often present since childhood and acquired diseases
like arsenicosis appear in later life.
(ii) Melanosis: Diffuse darkening of skin starts in the palm and gradually spreads to the whole body
(Photograph 1). Mild melanosis can be revealed by comparing with normal palm.
(iii) Spotted or rain drop pigmentation (spotted melanosis) is usually seen on chest, back or limbs.
This is a fairly common symptom. (Photograph 2 shows a patient with severe spotted melanosis). 50% of
the patients show spotted melanosis in chest, back and sometimes in the limbs, i.e., hands and legs.
(iv) Spotted and Diffuse Keratosis of palms and soles (Photograph 3) are signs of moderate to severe
toxicity. Rough, dry, spotted nodules (spotted keratosis) appear after 5-10 years in the palms and feet. Still
later (>10 years), the skin becomes dry and thickened . This stage is called diffuse keratosis. Gradually
thickening of soles can give rise to cracks and fissures (hyperkeratosis).
(v) Leucomelanosis This observation was also made first by Dr. K. C. Saha. About one third of the
patients develop pigmented and depigmented spots in legs or trunk, found in advanced stage of the disease.
Probably stimulation of melanocytes produces the pigmentation and damage in later stage is responsible for
the depigmentation spots. Leucomelanosis is common ( white and black in colour) in persons with advanced
arsenicosis or who have stopped drinking arsenic-contaminated water but had spotted melanosis earlier.
(Photograph 4 shows such a case in Nadia district). (vi) Dorsal keratosis i.e., rough dry skin often with
palpable nodules (spotted keratosis) on dorsum of hands, feet and legs are the signs seen in severe case
(Photograph 5). If the arsenic intake is high or the disease is of long duration- more than 10-15 years-
keratosis also develops in the dorsal skin of hands, feet, legs or even other parts of the skin (whole body
(vii) Combination of pigmentation (Melanosis) and nodular rough skin (spotted palmoplanter
keratosis) in post childhood age almost points to arsenic toxicity excluding other of causes of isolated
pigmentation and keratosis (nodular rough skin), Palmoplanter skin was involved in early phase and
keratosis of limbs in later phase.
Minor Dermatological Feature:
(i) Mucus membrane melanosis on tongue, gums, lips etc. may also be manifestations of arsenic toxicity.
In some cases pigmentation also appears in tongue, inner side of lips, gums or mucus membrane of mouth.
(ii) Non-Pitting oedema: In rare cases oedema appears in feet which does not pit on pressure without
any history of attracts of pain or fever, differentiationship from filarial lymphaedema. This was also first
pointed out as an additional sign of arsenicosis by one of us KCS.
(iii) conjunctival congestion: Sometimes observed (4%) as reddish eye due to conjunctional congestion
without any sign of inflammation like grating sensation, pain or sticky discharge.
3. Stage of Internal Complications: In this stage, non-dermatological toxic features appear in addition to
dermatological signs. The common complications are: Lungs, Asthmatic bronchitis (cough, expectoration,
breathlessness, and restrictive asthma). Symptoms of clinical phase are associated with different
complications as the other organs like lungs, liver, muscles, eyes, vessels are affected. Clinical symptoms are
associated with bio-chemical evidence of organ dysfunction as well as histological, histochemical
abnormalities and high concentrations of arsenic in different organ involved. Liver enlargement
(hepatomegaly), spleen enlargement (splenomegaly) & fluid in abdomen ascites are seen in several cases.
4. Stage of Malignancy: Malignancy affecting skin, lungs, bladder uterus or other organs develops if
patient survives the stage of complications. Malignancy does not develop before 10 years of arsenic
. Usually after 15-20 years after the onset of first symptoms, cancer develops. Skin cancers are
mostly monocentric but sometimes multicentric cases are also found. Usually they have slow progress for
years. But sometimes in 6 months malignancy extends to neighbouring glands and in 9 months to 1-year
time, patient often expires.
a) Skin, lungs, bladder, genito urinary tract etc.
b) Squamous cell carcinoma (Photograph No. 6), Basal cell carcinoma, Bowen's disease, Carcinoma
affecting lung, uterus, bladder, genitourinary tract or other sites are often seen in advanced neglected cases
suffering from 10-20 years.
Other Rare Signs:
(a) Arterial insufficiency (Blackfoot disease of Taiwan)
(b) Mee's lines in nails
Most laboratory animals appear to be substantially less susceptible to arsenic than humans. It has
been reported that chronic oral exposure to inorganic arsenic (0.05-0.1 mg/kg/day) causes neurological and
haematological toxicity in humans but not in monkeys, dogs, and rats exposed to arsenite or arsenate at
doses of 0.72 to 2.8 mg/kg/day.
There is good evidence that arsenic is carcinogenic in humans if exposed orally or by inhalation, but
not in animals. Therefore, quantitative dose-dependent data for animals should not be considered a reliable
source to apply to humans.
A. Respiratory Effects:
Effects of arsenic on the human respiratory system have been reported both from occupational
exposure as well as from tubewell water arsenic toxicity. Humans exposed to arsenic dust or fume inhalation
are more opt to be encountered in mining and milling of ores, in industrial processing, such as smelting
industry which often produces irritation of the mucous membrane, resulting in laryngitis, bronchitis, rhinitis
and tracheobronchitis, causing stuffy nose, sore throat, hoarseness and chronic cough etc.
Very high
exposure to unprotected workers may manifest perforated nasal septum after 1-3 weeks of exposure
, but
such effects are minor or absent at exposure levels of 0.01-1 mg/m
A fatal case of arsenic trioxide
inhalation manifested widespread tracheobronchial mucosal and sub mucosal haemorrhages with mucosal
sloughing, alveolar haemorrhages, and pulmonary edema.
Chronic asthmatic bronchitis and asthma is a
common complication of ground water arsenic toxicity
. No reports exist on the respiratory effects of
organoarsenicals in humans.
B. Cardiovascular Effects:
It has been suggested by several epidemiological studies that chronic inhalation of arsenic trioxide
can increase the risk of death in humans from cardiovascular disease.
Long term inhalation of inorganic
arsenic could injure the blood vessels or the heart. Zaldivar
reported several cases of myocardial
infarction and arterial thickening in children who consumed water containing about 0.6 mg/l arsenic.
Arsenic ingestion through food or water may have serious effects on the human cardiovascular
system. Both acute and chronic arsenic exposure cause altered myocardial depolarization and cardiac
arrhythmias that may lead to heart failure.
36, 53
Low level arsenic exposure by humans may also cause
vascular system damage, a classical example of which is Blackfoot disease, which is endemic in an area of
Taiwan where most drinking water contains 0.17 to 0.8 ppm arsenic
, corresponding to doses of about
0.01 to 0.5 mg As/kg/day.
In ground water arsenicosis of West Bengal this ischaenice gangrene from
vasenlitis are not seen probably due to less arsenic concentration circulating in blood stream.
Effects of arsenic on the vascular system have also been reported in a number of other populations.
In Chile, ingestion of 0.6 to 0.8 mg/l arsenic in drinking water (equivalent to 0.02 - 0.06 mg As/kg/day)
increased the incidence of Raynaud's disease and of cyanosis of fingers and toes.
13, 143
Thickening of blood
vessels and their oclution were noticed due to arsenic in beer poisoning.
90, 110
In a case of acute voluntary
massive arsenic in toxicaction, the muscles showed hypercontracted fibres, myofibrillar disruption,
mitochondrial abnormalities and cytoplasmic vacuoles.
No data are available for cardiovascular effects
due to organoarsenicals.
C. Gastrointestinal Effect:
Gastrointestinal symptoms are common in acute poisoning but not in chronic like ground water
arsenicosis. Workers exposed to high levels of arsenic dusts or fumes suffer from nausea, vomiting and
Clinical signs of gastrointestinal irritation from acute arsenic poisoning include burning lips,
painful swallowing, thirst, nausea and several abdominal colic.
These symptoms are usually not
detectable at exposure levels below 0.01mgAs/kg/day
and they decline within a short time after exposure
ceases. The efficiency of absorption or inorganic arsenicals from the gastrointestinal tract is related to their
water-solubility. Chakraborty and Saha
reported three deaths in India due to chronic arsenic poisoning by
drinking water from tubewells having mean arsenic content of 0.64mg/l. The most likely mechanism of
gastrointestinal toxicity is damage to the epithelial cells, with resulting irritation. Tay and Seal
gastrointestinal involvement in 17 of 74 people ingesting arsenic at an estimated dose of 3 to 10 mg/day
through an herbal preparation.
D. Hematological Effects:
The haematopoietic system is also affected by both short-and long-term arsenic exposures. Anemia
and leukopenia are common effects of poisoning and have been reported as resulting from acute
and chronic oral exposures.
These effects may be due to a direct haemolytic or cytotoxic
effect on the blood cells
and a suppression of erythropoies.
No such effects were noticed in humans
exposed chronically to 0.07 mg As/kg/day or less. Relatively high doses of arsenic have been reported to
cause bone marrow depression in humans.
Mizuta et al.,
reported anemia and lenkopenia in adults
ingesting 3 mg As/day in soy sause. The malnutrition is a major causes of anaemia is underdeveloped
country like India and Bangladesh. Hence the anaemia in patients of arsenicosis is to be properly judged for
the amount of the two causes.
High concentration of arsine (10 ppm) cause death within hours
due to red blood cell
Low levels of arsenic (0.5-5.0 ppm) bring about these effects in a few weeks, and an
average concentration of 0.5 mg/l (0.2mg/m
) is considered acceptable in the work place.
Renal damage is
secondary and occurs due to clogging of nephrons with hemolytic debris.
Mono-, di-, and
trimethylarsines are strong irritants but are less hemolytic than arsine.
Arsine exposure by humans is usually
fatal without proper therapy.
Arsine breaks down in the body to inorganic arsenic and methylated
derivatives (less toxic than arsine).
The mechanism of hemolysis involved depletion of intracellular GSH, resulting in oxidation of
sulfhydryl groups in the hemoglobin from ferrous to ferric in mice and rats. Haemocyanin combines with
arsenic, which reduced oxygen uptake by cells and therapy prevents hatching.
E. Hepatic Effect:
Arsenic was the first chemical agent to which liver disease was attributed in humans. Since the liver
tends to accumulate arsenic with repeated exposures, hepatic involvement has been reported most
commonly as a complication of chronic exposures over periods of months or years.
8, 24
Patients may first
come to medical attention with bleeding esophageal varices, ascites, jaundice, or simply an enlarged tender
liver. Hepatic lesion that formed after prolonged ingestion of arsenic-containing medicines (Fowler's
Solution) have been described. Clinical examination often reveals that the liver is swollen and tender.
The analysis of blood sometimes shown elevated levels of hepatic enzymes.
These effects are most often
observed after chronic exposures to as little as 0.02 to 0.1 mg As/kg/day.
Arsenic has been observed
to produce mitochondrial damage and impaired mitochondrial functions, and accordingly might be expected
to affect porphyrin metabolism. Franklin et al.,
Hepatic fatty infiltration and cirrhosis of the liver in patients
who used Fowler's solution. Non cirrhotic portal fibrosis and finally cirrhosis with hepatic failure results in
ascitis jaundice and coma.
F. Renal Effects:
Like the liver, the kidneys will accumulate arsenic in the presence of repeated exposures. The
kidneys are the major route of arsenic excretion, as well as major site of conversion of pentavalent arsenic
into the more toxic and less soluble trivalent arsenic. Sites of arsenic damage in the kidney include
capillaries, tubules, and glomeruli.
Damaged proximal tubular cells lead to proteinuria and casts in the urine. Mitochondrial damage is
also prominent in tubular cells. Oliguria is a common manifestation, but if acute arsenic poisoning is
sufficiently severe to produce shock and dehydration, there is real risk of renal failure, although dialysis has
been effective in overcoming this complication.
Arsine-induced hemolysis is likely cause tubular necrosis with partial or complete renal failure,
requiring hemodialysis for removal of the hemoglobin bound arsenic.
G. Dermal Effects:
Skin disorders have been documented in several epidemiological studies in which people consumed
drinking water that contained arsenic of levels of 0.01 to 0.1 mg As/kg/day or more. Characteristic effects
of arsenic ingestion included generalized hyperkeratosis, warts or corns on the palms and soles, and areas of
hyperpigmentation interspersed with small areas of hypopigmentation on the face, neck, and back.
12, 13, 21, 59,
61, 143, 107
Several epidemiological studies involving 20 to 200 people detected no dermal or other effects as a
result of exposure to chronic doses of 0.003 to 0.01 mg As/kg/day.
118, 131
A chronic oral dose of 0.01 mg
As/kg/day or less would pose little risk of noncancer effects in humans.
H. Neurological Effects:
Several studies have indicated that ingestion of inorganic arsenic can result in neural injury. Like the
cardiovascular system, both the peripheral and central components of the nervous system can be damaged
by arsenic.
103, 115, 136, 137
In the experience of one of us KCS
, no neuropathy were found but one case of
myopathy was seen. In acute high exposures (1 mg As/kg/day or more) often cause encephalopathy with
such symptoms as headache, lethargy, mental confusion hallucination, seizures, and coma.
Individuals with
repeated arsenic exposures frequently contract sensorimotor polyneuropathy, which usually, but not always,
displays symmetrical involvement and which may resemble Landry-Guillain-Barre Syndrome in its
presentation. Neuropathy may appear in 1 to 5 weeks after an acute exposure and is produced mainly by
axonal degeneration.
Symptoms of chronic encephalopathy include persistent headache, diminished recent memory,
distractibility, abnormal irritability, restless sleep, loss of libido, increased urinary urgency, and increased
effects of small amount of ethanol.
Secondary depression, anxiety, panic attacks and somatizations are
common, in addition to the organic cognitive impairment documented by neuropsychological testing.
Electromyographic technique (EMG) used to detect neuropathy showed decreased nerve condition
amplitude with little change in nerve condition velocity.
Bansal et al.
reported asymmetric bilateral phrenic
nerve involvement in a patient who was poisoned by arsenic.
Inhalation of inorganic arsenic can cause neurological injury in humans they may include peripheral
neuropathy of both sensory and motor neurons causing numbness loss of reflexes, and muscle weakness.
I. Developmental Effects
It is not well established whether ingestion of inorganic arsenic can cause developmental
abnormalities in humans. No overall association between arsenic in drinking water and congenital heart
defects was found in a case-control study in Boston
, although an association with coarctation of the arota
was noted. Nordstrom et al.,
96, 98
found that babies born to women exposed to arsenic dusts during
pregnancy had a higher than expected incidence of congenial malformations. The average birth weight of the
babies was slightly below average.
The incidence of spontaneous abortion in women who lived near a
copper smelter in Sweden tended to decrease as a function of distance.
A couple of studies reported an
increased number of miscarriages among women who worked in the semiconductor industry, which cause
18, 68
No reports exist concerning the development effects of organoarsenical compounds in humans.
In chronic arsenicosis from ground water, no development defect has been experienced by one of us
J. Reproductive Effects
Hardly any published information exists regarding reproductive effects in humans and animals after
inhalation exposure to arsenic or organoarsenicals. The same is true for human oral exposure to these
K. Genotoxicity Effects
Inhalation exposure to arsenic trioxide increased the frequency of chromosomal aberrations in the
perpheral lymphocytes of smelter workers
8, 95
and in fatal mouse livers of mothers exposed to 22 mg As/m
during the gestation period (days 9-12).
These data do not indicate that arsenic is mutagenic, but they do
indicate that it is clastogenic. There is no conclusive evidence that arsenic causes point mutations in any
cellular system.
9, 27
However, Li and Rossman
have shown that arsenite causes inhibition of DNA repair
after the incision step in Chinese hamster V79 cells.
L. Mutagenic Effects:
Mutagenesis includes the induction of DNA damage and a wide variety of genetic alterations, which
can range from simple gene mutations (DNA base-pair changed to grossly visible changes in chromosome
structure or number clastogenesis). Some of these changes may cause genetic damage transmissible to
subsequent generations, and/or some may cause cancer or their problems in the exposed generation.
Arsenic has long been known to cause chromosomal damage, but most investigators have been
unable to induce direct gene mutation.
This apparent pardon, plus occasional poor convrelation
between arsenic exposure dose and resultant frequency of chromosomal aberrations, have been explained
by the concept that arsenic promotes genetic damage in large part by inhibiting DNA repair.
10, 71, 95, 110
repair inhibition may be a basic mechanism for the comutagenicity and presumably the cocarcinogenicity of
Comparisons of chromosome aberration frequencies induced by trivalent and pentavalent arsenic
have indicated that the trivalent forms are far more potent and genotoxic than the pentavalent forms.
7, 86, 93
Enzymes such as superoxide disumutese and catalase that scavenge for Oxygen free radicals seem to
provide protection against arsenic induced DNA damage, indicating a possible basis for the genotoxic effect
of arsenic.
M. Immunologic Effect:
The effect on the immune system of inhalation exposure to arsenic is not well studied. No
abnormalities were detected in the serum levels of immunoglobulins of workers exposed to arsenic in a coal-
burning pone plant.
The levels of arsenic were not measured in this study and they may have been too
small to cause significant damage.
N. Carcinogenic Effect:
Introduction of cancer appears to be the most striking long-term effect of chronic expose to
inorganic arsenic. Epidemiological studies have demonstrated an evident causal relationship between
environmental, Occupational, and medical exposure of man to inorganic arsenic and cancer of the skin and
Most animal experiments, however, were not able to demonstrate concinogenicity,
except for very few observations of increased incidence of leukaemia and lung cancer.
There exists a clear association between pre-cancerous dermal keratosis, epidermoid Carcinoma of
the skin and to some extent, lung cancer and exposure of humans to water-soluble inorganic arsenic through
drinking water with high natural arsenic content or through contaminated beer and wine. Epidemiological
studies in Argentina, Chile, Canada, and Taiwan Suggest correlations between drinking water that contains
arsenic and blackfoot disease, Bowens disease and skin cancer.
O. Cancer of the Respiratory System:
An excess of deaths due to respiratory cancer has been observed among workers exposed to
inorganic arsenic in the production and use of pesticides (spray) gold mining, and in the smelting of
nonferrous metals, especially copper.
5, 28, 39, 46, 69,102
An increase of lung cancer with increasing duration of exposure to arsenic compounds but not with
non-arsenic products. Cases of lung cancer house also been reported among workers engaged in the
spraying of insecticides containing inorganic arsenic. Fishbein
states that the probability of death from lung
cancer in persons with arsenical keratosis is 5 to 10 times higher than expected and IARC
has conducted
that "there is sufficient evidence that inorganic arsenic compounds are skin and lung carcinogens in humans.
Therapy with inorganic arsenicals has also been associated with the development of precancerous skin
lesions, multiple epitheliomatosis and bronchial carcinoma.
P. Cancer of the Skin:
Skin cancer has been associated with inorganic arsenic exposure.
Skin cancers are mostly
monocentric but sometimes multicentric cases are also found.
Table 1 shows the increasing incidence of
arsenicosis. Several types of neoplastic changes of the skin, including, Bowen's disease and basal cell
carcinoma of arsenical origin are usually multiple and located on the trunk.
Squamous cell carcinomas develop prima from the keratoses on the extremities. Multiple basal cell
carcinoma has been related to arsenical therapy
as also an epitheloid angiosarcoma for right adrenal
The exposure occurred most frequent via the oral route, either through contaminated drinking water
or medication. Ingestion has usually taken place over several decades with daily doses of several mg of
arsenic. In various types of skin cancer, the most common being multiple basal cell carcinomas.
Q. Biochemical Effects
Arsenical compounds are known to inhibit a number of important enzymes in both animals and
humans. Phenylarsine oxide (PAO) blocks glucose transport activity by inhibiting insulin activation of
glucose uptake in rat soleus muscles
and in 3T3-L1 adipocytes
, in which vicinal thiol are implicated in
signal transmission, These vicinal groups includen -SH, -SH/-OH and -SH/-CO
H, which take part in
insulinstimulated sugar transport.
30, 58
Arsenite is rapidly and extensively accumulated in the liver, where it inhibits NAD-linked oxidation
of pyruvate or ? -ketoglutarate. This occurs by complexation of trivalent arsenic with vicinal thiols necessary
for the oxidation of this substrate.
Arsenic is a normal component of the human body. Once ingested, soluble forms of arsenic are
readily absorbed from the gastrointestinal tract. Absorption rate estimates range from 40 to 100% for
humans. Arsenate, As(V) whether inorganic or organic, is better absorbed than As(III) arsenite because
arsenate is less reactive with membranes of the gastrointestinal tract. Arsenic in drinking water is mostly in
the arsenate form, and complete absorption of arsenic from water may occur.
Once absorbed, arsenic is transported by the blood to different organs in the body, mainly in the
form of MMA. Typical levels in the blood of people who are not exposed to a significant source of arsenic
pollution range from 1 to 5 ?g/l As
; levels in soft tissue range from 0.01 to 0.1 ?g As/gm.
The highest
levels may be found in nails and hair (0.1 to 1?g As/g) where arsenic accumulates over time.
Metabolism of arsenic in humans involves two processes. After entering a cell, arsenate is reduced
to arsenite. Arsenite is then methylated to form MMA and DMA; this process occurs primarily in the
Trimethylarsine oxide, although expected to be formed during arsenic metabolism has not been
identified in humans, and its significance in organic metabolism is still not known.
Inorganic As(V) and As(III) have different mechanisms of action. Arsenate (As(V)) behaves very
much like phosphate consequently, it can substitute for phosphate in normal cell reactions, interesting with
normal cell functions.
In contrast, arsenite [As(III)] has a high affinity for thiol (-SH) groups in proteins,
causing inactivation of a variety of enzymes.
Because arsenate is reduced in the body to arsenite,
arsenate in drinking water may have a biological effect identical to arsenite.
In contrast to inorganic arsenic, neither MMA nor DMA binds strongly to molecules in humans.
Hence their relative acute toxicity is less than that of inorganic arsenic form.
In general, inorganic As(V) is
one tenth as toxic as inorganic As(III), and MMA and DMA are less toxic than inorganic As(V).
ingestion, inorganic arsenic that is not immediately excreted or absorbed by tissues is progressively
detoxified through the methylation process. However, the chronic effects of a MMA DMA are not known
only a few studies have evaluated DMA.
The form of arsenic significantly affects the rate at which arsenic is excreted from the body. Some of
the inorganic arsenic is excreted primarily via urine as the parent form of the ingested arsenic. After
methylation, it is also excreted as MMA and DMA. Humans rapidly excrete most blood arsenic, with 50 to
90% cleared in two to four days
. The remainder is cleared 10-100 times more slowly.
The pharmacokinetics of arsenic in the human body are not well understood. Although several
pharmacokinetic models have been developed, thinly apply to short-term exposure (two to four rats) and
have several limitations that cause them to inaccurate projection.
Further development and refinement of
pharmacokinetic and pharmacodynamic models are important, however. They may provide insight into
arsenic health effects at low levels of exposure and help to interpret epidemiological studies on As, most of
which have used ecological study design.
Arsenite compound mainly absorbed to the human elementary canal and it deposited hugely to the
various cells in the body. As a result it affect the enzyme activity in the cell and finally the affected cells are
dead slowly.
1st step.
Pyruvic acid (which is obtained from the glucose of inside the cell mitogondia) breaks with the help of a
special type of enzyme. The pyruvate oxidase complex is necessary for oxidative decarbonylation of
pyruvate produce to acetyl coenzyme A and carbon dioxide before it enters the tricarboxylic acid cycle. In
this process energy is store for workable of cells.
The enzyme system comprises several enzymes and cofactors one protein molecule of enzyme
having one lipoic acid. And in one lipoic acid having two sulfhydryl (-SH) or thiol group, which is essential
for its workability.
In the presence of trivalent arsenic (Arsenite) it replace the two Hydrogen from the thiol group and
attached with sulfur molecule and formed a dihydrolipoyl-arsenite chelate complex, which preveating the
reoxidation of the dihydrolipoyl group necessary for continued enzymatic activity, and this pivotal enzyme
step is block. As a result amount of pyruvate in blood increases energy production is reduced and finally
the cell damage slowly.
In the same manner arsenic destroy workability of another enzyme and reduced production of
succinyl coenzyme A and finally production of ATP reduced. If arsenic is deposited in long time then it
breaks the ATP block the energy supply to the cells.
Step 2
The arsenate form of inorganic arsenic are available in nature. This also block the enzymatic activity in
mitochondria but in different way. The next steps of ADP from the continuing enzymatic activity combine
with inorganic phosphate and produce ATP. This reaction is called oxidative phosphorylation. Since arsenic
can replace phosphorus, so it combine with ADT to replacing phosphate and subsequent formation of an
unstable arsenate easter bond that is rapidly hydrolysate. As a result though oxidation is occur but
production of ATP through phosphorylation is hampered and source of energy in cell reducing continually
not only this but also it disturb the electron transfer of inorganic phosphorus with ATP. Thus, the so-called
high-energy bonds of adenosine triphosphate are not conserved in the presence of arsenate. This process is
termed arsenolysis.
Arsenic may therefore be doubly toxic to cellular respiration by inhibiting energy-
Linked functions of the mitochondria in two very different ways.
1. Trivalent arsenic inhibits the reduction of nicotinamide adeine dinucleotide by deactivating
critical enzymes in the tricarbonylic acid cycle, and
2. Pentavalent arsenic uncouples oxidative phosphorylation by arsenolysis.
Another important enzymatic reaction is the production of ATP with succinic acid or succinate
through flevo protein reduction, Arsenate compound disturbed in this reaction also, as a result energy supply
in cells reduced.
A. Acute Arsenic Poisoning
Acute arsenic toxicity is practically not seen in the present days. Because there are many easier
ways of suicidal and homicidal poisoning. Treatment is just like cholera and dehydration.
B. Chronic Arsenic Poisoning
Arsenic has been used as a medicine and as a poison since humans first became interested in
chemistry. The untoward effect of "medicinal" arsenic, primarily inorganic arsenite, have only recently been
appreciated because their ill effects are of a chronic nature and large epidemiologic databases are needed to
define deleterious outcomes. The toxic properties of all arsenic preparations are dose-dependent. Regarding
the administration of arsenic, the dictum of paracelsus (1493? -1541) is appropriate to remember: "All
substances are poisons; there is none which is not a poison. The right dose differentiates a poison and a
remedy. "Arsenic is rapidly cleared from the blood stream and the major route of arsenic elimination is
through the kidneys as methylated arsenic metabolites, the preferred sample for diagnoestic analysis is a
24hrs urine collection, Arsine exposure may also be assessed by analysing the content in hair and nails
because arsenic tends to accumulate in these tissues over time. Analysis of scales has been form as
additional measure by Prof. Saha.
In cases of chronic arsenic poisoning one should consider BAL (British antilewisite) as a chelator
the signs of arsenicosis are severe or the patient is in complications.
Treatment by BAL is superior to
During the clinical phase, when symptoms like melanosis and keratosis appear on the skin, cheleting
agents like BAL, Penicillamine, DMSA/DMPS help in clearing melanosis. Mechanical scraping of soles of
feet can be done to relieve keratosis. Urea and salicylate ointments can also be used. Prolonged used of
chelating agent BAL with mechanical scraping of water soaked keratotic soles and palms give encouraging
results. Urea (20%) in cream or vaseline, followed by 6-10% salicylic acid, also helps for smoothening of
skin. Follow-up of treated patients at monthly interval for clinical and chemical assessment is helpful for final
assessment of the treatment
. During the phase of internal complications, symptomatic treatment has to be
applied using antibiotics. Glucose-Methionine has to be applied for the treatment of liver damage leading to
ascitis and portal hypertension.
In case of malignacy, clelating agents, become useless. Early surgical removal of the affected parts
(if no melanosis or granular spread) and chemotherapy may prolong life. But such treatments cannot cure
the desease after cancer sets in; they can only prolong the suffering using highly expensive drugs.
Dimercaprol (2, 3-dimercaptopropanol) is the traditional chelating agent used, but Penicillamine has
been used with some success.
Parenteral dimercaprol is administered intramuscularly at an initial dose of
3 to 5 mg/kg of body weight every 4 hr. the dose should be tapered but administration continued until the
urinary arsenic excretion is less than 50kg per 24 hr. This therapy is frequently effective in preventing or
neutralizing systemic toxicity. In most cases, the degree of recovery from neuropathy, aplastic anaemia,
encephalopathy and jaundice is limited and directly related to the initial severity of the systemic involvement
and the rapidity with which chelation therapy in initiated.
Penicillamine, although only a monothiol agent, has been used successfully; its great advantage is that
it may be orally administered. Both agents have a high frequency of side effects, although this is less of a
problem in the presence of large amounts of body arsenic.
A recently reintroduced drug that appears to be a promising agent for treating arsenic poisoning is 2,
3-dimer captosuccinic acid. this is a dithiol agent that can be orally administered and has few reported side
Table 2 shows the medicine for arsenicosis disease.
It is obvious that high-arsenic drinking water may be a factor in arsenic toxicosis in human beings. It
seems to be important in the control of the disease to consider how to prevent arsenic intake from drinking
water. The symptoms and signs of arsenic poisoning may be reduce if the quality of drinking water
improved. In some cases, the symptoms and signs of arsenic poisoning were reduced three years after the
quality of drinking water improved. The morbidity rate also declined.
Numerous studies suggested that improvement of water quality, the rate of improvement in the symptoms
and signs of arsenic poisoning in human beings may increase with a decrease in arsenic level in the drinking
water source.
Furthermore, it was observed that new cases of human poisoning occurred only when arsenic
concentrations in the drinking water source exceeded 0.15 mg/L. (Table-3). At the same time, it was also
found that arsenic levels in the urinary samples from cases of human poisoning also declined with a decrease
in the arsenic levels in water source for drinking. (Table-4). Thus, it may be essential for the control of the
disease to improve water quality in areas of endemic arsenic toxicosis.
1. Exposure to arsenic may come from natural source, from industrial source, or from administered
acute poisoning.
2. Chronic arsenical dermatosis arises from consuming arsenic contaminated drinking water for long
3. Ingestion via food or water is the main pathway of arsenic into the organism.
4. Humans are more sensitive to arsenic than animals.
5. Weak and malnutritious people can be easily affected by arsenic contaminated water or fume or
dust or contact at the skin.
6. Melanosis may disappear by using medicine but keratosis can not alter though further complication
may be prevented.
7. No medicine was found effective once complication developed.
8. Arsenic free water or environment or decrease in arsenic concentration level is only the solution of
TABLE 1 Increasing incidence of arsenicosis-cumulative (1983-97)
Cancer incidence
A. D.
A. B.
A. V.
No data
A. D.- Affected Districts
A. B.- Affected Blocks
A. V.- Affected Village
Blad.- Bladder
GUTR- Genito Urinary Tract
TABLE 2 Medicine for arsenic diseases, which are tried.
Chelating agent Therapeutic use
Dithiol & monothiol agents (BAL)
Penicillamine SMSA & DMPS
A Specific line of treatment for relief of clinical manifestations
and chelating reduction of arsenic stores in the body, reducing
subsequent-cancer risk.
DMSA &DMPS Effective in the treatment of chronic arsenic toxicity, but costly
and not in available in India.
BAL (British Antilewisite) Used as a chelator when arsenic extraction from tissue is
required, treatment for severe arsenic poisoning.
Dimercaprol (2, 3-dimercaptopropanol) Traditional chelating agent
Penicillamine (monothiol agent) This is also a chelating agent, which is used successfully with
its great advantage that it may be orally administered.
2,3-dimercapto succinic acid (Dithiol
Recently reintroduced drug that appears to be promising
agent for treating arsenic poisoning.
Results as per experience of one of us (KCS) are not satisfactory. Melanosis disappears or diminished in 1-
2 month appreciately but keratosis is not altered. It prevents the further complications but malignancy may
not be prevented.
TABLE 3 Relationship Between the Rate of Improvement in Symptoms and Signs and
Arsenic Level in Drinking Water.
Improvement in symptoms
and signs.
New class
New class
of Cases
Rate (%)
0.0 – 0.04
0.05 - 0.14
0.15 - 0.25
0.26 - 0.4
0.50 and up 7 0 0 4 3 -
TABLE 4 Correlation Between Arsenic Level in New Water Source and Arsenic Level in
Urine Arsenic level (mg/l)
Water arsenic
Cases observed
0.0 - 0.04
0.05 - 0.14
0.15 - 0.25
0.26 - 0.3
0.40 and up 14 0.228 0.037
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Photograph 1. Melanosis (Whole body)
Photograph 2. Spotted melanosis (rain drop disease)
Village: Jampukur, Kaligang, Dist. Nadia
Photograph 3. Leucomelanosis, Village: Bishnupur, Gaighata
Block, Dist. North 24 Pargana.
Photograph 4. Spotted and diffuse with nodular keratosis on sole.
Vill. Chandpur Rail line, Bashir Hat, Block-II, Dist. North 24-Pargana.
Photograph 5. Palpable nodules in dorsum on hands, feet and legs,
Village: Mandra, Purbasthli Block I, Dist: Burdwan.
Photograph 6. Squamous cell carcinoma (SCC), Asokenagar,
Habra Block II, District : North 24-Parganas.
... Rice is one of the staple food crops. Arsenic contamination in staple food crops leads to a decline in yield and is also health hazardous to humans (Saha et al., 1999;Kandhol et al., 2022). ...
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The growth and development patterns of crop plants are being seriously threatened by arsenic (As) contamination in the soil, and it also acts as a major hurdle in crop productivity. This study focuses on arsenate As(V) mediated toxicity in rice plant. Further, among the different type of NPs, iron oxide nanoparticles (FeO NPs) display a dose-dependent effect but their potential role in mitigating As(V) stress is still elusive. FeO NPs (500 μM) play a role in imparting cross-tolerance against As(V) induced toxicity in rice. Growth attributes, photosynthesis performance, nutrient contents and biochemical parameters were significantly altered by As(V). But FeO NPs rescued the negative consequences of As(V) by restricting its entry with the possible involvement of NO in rice roots. Moreover, results related with gene expression of NO (OsNoA1 and OsNIA1) and proline metabolism were greatly inhibited by As(V) toxicity. But, FeO NPs reversed the toxic effect of As(V) by improving proline metabolism and stimulating NO mediated up-regulation of antioxidant enzymes particularly glutathione-S-transferase which may be possible reasons for the reduction of As(V) toxicity in rice roots. Overall, it can be stated that FeO NPs may act as an As(V) barrier to restrict the As(V) uptake by roots and have the ability to confer cross tolerance by modulating various morphological, biochemical and molecular characteristics with possible intrinsic involvement of NO.
... In Bangladesh, the condition is the worst in the history of groundwater poisoning from arsenic contamination. Some humans and other living beings face several problems such as hypertension, skin cancer, skin lesions, cardiovascular diseases, pulmonary diseases, neurological effects, and diabetes (Saha et al. 1999, Kile and Christiani 2008, Hendryx 2009). Therefore, it is necessary to check the vulnerability level of groundwater by producing vulnerability maps, protecting, and preserving groundwater from all kinds of contamination. ...
Groundwater vulnerability assessment plays a vital role in earmarking the regions into several zones of the different vulnerability of contamination, thereby helping in proper land use management and groundwater monitoring. DRASTIC is the most widely used model for the assessment of the vulnerability of groundwater to contamination. The research gap associated with the DRASTIC model is that the weights and ratings of the parameters associated with the DRASTIC model are based on Delphi network technique which is subjective. The present work tries to optimize the weights and ratings of DRASTIC parameters with multi-criteria decision analysis (MCDA) techniques and fuzzy logic. Further, we compare the optimized values of weights and ratings of different parameters of the DRASTIC model arrived via different MCDA techniques and fuzzy logic and recommend that fuzzy logic provides the most reliable values of weights and ratings for DRASTIC parameters to be employed in the vulnerability assessment because it removes the human subjectivities inherent in MCDA techniques. The fuzzy model gives quite reliable values of DRASTIC parameters as it includes the fuzziness of continuous input values. However, there is a need to find out the one universal technique which should be applicable in any surface area, including all kinds of nonlinearity, and it possesses the self-learning ability to bring results as accurately as possible.
... Heavy metals are non-biodegradable elements [4] that cause detrimental effects on the natural ecosystem and human health when their concentration goes beyond permissible limits. For instance, persistent intake of inorganic arsenic causes lung, bladder, skin, and kidney cancer in humans via consumption of drinking water [5]. Mercury accumulation in the food chain shows a negative impact on human health such as kidney and pulmonary function impairment, chest pain, and damage to the central nervous system [6]. ...
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Water is a vital resource that is required for social and economic development. A rapid increase in industrialization and numerous anthropogenic activities have resulted in severe water contamination. In particular, the contamination caused by heavy metal discharge has a negative impact on human health and the aquatic environment due to the non-biodegradability, toxicity, and carcinogenic effects of heavy metals. Thus, there is an immediate need to recycle wastewater before releasing heavy metals into water bodies. Hydrogels, as potent adsorbent materials, are a good contenders for treating toxic heavy metals in wastewater. Hydrogels are a soft matter formed via the cross-linking of natural or synthetic polymers to develop a three-dimensional mesh structure. The inherent properties of hydrogels, such as biodegradability, swell-ability, and functionalization, have made them superior applications for heavy metal removal. In this review, we have emphasized the recent development in the synthesis of hydrogel-based adsorbent materials. The review starts with a discussion on the methods used for recycling wastewater. The discussion then shifts to properties, classification based on various criteria, and surface functionality. In addition, the synthesis and adsorption mechanisms are explained in detail with the understanding of the regeneration, recovery, and reuse of hydrogel-based adsorbent materials. Therefore, the cost-effective, facile, easy to modify and biodegradable hydrogel may provide a long-term solution for heavy metal removal.
Heavy metal (HM) exposure remains a global occupational and environmental problem that creates a hazard to general health. Even low-level exposure to toxic metals contributes to the pathogenesis of various metabolic and immunological diseases, whereas, in this process, the gut microbiota serves as a major target and mediator of HM bioavailability and toxicity. Specifically, a picture is emerging from recent investigations identifying specific probiotic species to counteract the noxious effect of HM within the intestinal tract via a series of HM-resistant mechanisms. More encouragingly, aided by genetic engineering techniques, novel HM-bioremediation strategies using recombinant microorganisms have been fruitful and may provide access to promising biological medicines for HM poisoning. In this review, we summarized the pivotal mutualistic relationship between HM exposure and the gut microbiota, the probiotic-based protective strategies against HM-induced gut dysbiosis, with reference to recent advancements in developing engineered microorganisms for medically alleviating HM toxicity.
Arsenic (As) is a toxic metalloid widely distributed in water, soil, and air. Arsenic contamination is currently considered as a major public health concern. This study investigated arsenic removal by Fe(II)-oxidizing bacteria in aqueous solution. A bacterial strain, Z1, isolated from concentrated sludge, was identified as Sphaerotilus natans based on microscopic morphology, culture characteristics, and 16s rRNA gene sequences. After arsenic resistant acclimation, Sphaerotilus natans Z1 successfully survived and propagated in high arsenic condition (100 mg·L-1 As(V) or As(III)). The isolated strain could, to a certain extent, decrease the concentration of As(III)/As(V) by biosorption under organic substance supply. Partial As(V) could be reduced to As(III) due to cytoplasmic arsenic reduction of bacteria. In addition, ferrihydrite, one of the iron oxides, was formed by the mediation of Sphaerotilus natans in Winogradsky medium. It was found that most of As(III)/As(V) could be effectively removed by sorbing onto the resultant ferrihydrite mineral. Thus, iron oxides mineral facilitated by Sphaerotilus natans may be an alternative remediation strategy for scavenging arsenic in water environment.
Arsenic (AS) toxicity is considered as one of the biggest environmental issue and a major public health problem. In this chapter we have summarized the impact of AS contamination on human health. A perusal of literature reveals that exposure to higher concentrations of AS is serious for a number of reasons. Such exposure for a longer period leads to ill effect on several organ systems of the human body. The adverse effects of inorganic AS cause many human diseases, human sufferings and increased human mortality and also affect various age groups variously. Population of some countries are more vulnerable to AS contamination problems. Studies have revealed the mechanisms of many AS induced diseases particularly cancer, cardiovascular effects, immunological effects and neurological effects in human. This article presents the scientific information emerged especially during the last two decades in the field of the ecotoxicological properties of AS and the potential mechanism of AS-induced toxicity, with a special emphasis on AS-induced carcinogenesis.
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Biomedical research in line with most baseline studies, has proven biological alterations due to exposure to some heavy metals such as lead, mercury, cadmium, and arsenic have been implicated in patients with neurochemical imbalance, pharmacological viewpoint, and brain imaging as part of psychotic prognosis. Some of the most prevailing psychological conditions with notable tendencies of downheartedness and transience are depression and schizophrenia. However, the basal pathophysiology of these conditions from the pre symptomatic and diagnosed point of view, implicates dopamine, norepinephrine, and 5-HT neurotransmitters. Maternal Immune Activation (MIA) triggered by immunological changes from external factors mutating against the immune cells from predisposition to heavy metals leads to priming of the Central Nervous System (CNS) microglia cells which can create a pathway to expose offspring to psychosis. Based on this information, psychosis has been framed due to deficiency in neural signaling in homeostatic imbalance from oxidative stress, metabolic cascades, influenza, and inflammatory response. This review gives details of the role played by neurotransmitters and heavy metals, their toxicity mechanisms, along with the health effect leading to mental disorders like psychosis, depression, bipolar disorder, schizophrenia etc. Hence, the need for more research in this budding field and the challenges of identifying and developing new treatments for persons predisposed to lengthened risk of neurological autoimmune disorders should be considered.
Globally, groundwater with high fluoride and arsenic receives extensive concern because of its wide distribution and great harm to human health caused by drinking water. In this paper, taking Tumochuan Plain in China as an example, based on hydrogeological investigation, groundwater flow system theory and hydro-chemical analysis methods were applied to reveal the mechanism of high fluoride and high arsenic in arid and semi-arid regions. In unconfined and confined groundwater of Tumochuan Plain, the highest concentration of fluoride is 7.2 and 11.2 mg/L respectively, and the highest concentration of total arsenic is 200.3 and 162.3 μg/L respectively. Fluoride in groundwater is mainly derived from the soluble fluoride in soil and aquifer medium. Because of the water-rock interaction, the alkaline environment caused by the hydrolysis of feldspar minerals in the central part of the plain has an important influence on the accumulation of F and As in this area. High fluoride water is formed in the alkaline environment (high pH values) of high concentration of Na⁺ and low concentration of Ca²⁺. The high arsenic groundwater is distributed in the alkaline reducing environment that the content of soluble salt in aquifer media is high (>200 mg/100 g dry soil). The reductive dissolution of iron and manganese oxides and competitive adsorption of HCO3⁻ all contribute to a high level of arsenic in both unconfined and confined aquifers. The research results have important guiding significance for water supply safety and water quality improvement in arid-semiarid areas in the world with high fluoride and high arsenic groundwater distribution.
Water is a valuable natural resource, which plays a crucial role in ecological survival as well as economic progress. However, the water quality has deteriorated in recent years as a result of urbanization, industrialization and human activities due to the uncontrolled release of industrial wastes, which can be extremely carcinogenic and non-degradable, in air, water and soil bodies. Such wastes showed the presence of organic and inorganic pollutants in high dosages. Heavy metals are the most obstinate contaminants, and they can be harmful because of having a variety of detrimental consequences to the ecosystem. The existing water treatment methods in many situations may not be sustainable or effective because of their high energy requirements and ecological impacts. In this review, state-of-the-art water treatment methods for the elimination of heavy metals with the help of protein nanofibrils are covered featuring a discussion on the strategies and possibilities of developing protein nanofibrils for the active elimination of heavy metals using kitchen waste as well as residues from the cattle, agriculture, and dairy industries. Further, the emphasis has been given to their environmental sustainability and economical aspects are also discussed.
This chapter provides an overview of inorganic and organometal pesticides. There are at least eighteen elements that characterize one or more inorganic pesticides. Of these elements, ten elements, namely, chromium, copper, zinc, phosphorus, sulfur, tin, arsenic, selenium, fluorine, and chlorine have been shown to be essential for normal growth. Their toxic effects do not depend on the element, but on the specific properties of one form of the element or one of its compounds, or merely on an inordinately high dosage. The other eight elements, namely, barium, cadmium, mercury, thallium, lead, bismuth, antimony, and boron have not been shown to be essential to growth of animals, although there is evidence that some may be helpful. It is suggested that toxicity is not an argument against essentiality. Some highly toxic elements such as iron, selenium, arsenic, and fluorine are essential to normal development. Characteristic features of several compounds of the eighteen elements are discussed along with their chemical name, chemical structure, synonyms, physical properties, chemical properties, formulations, and their uses. The mode of action, toxicity to humans and laboratory animals, and therapeutic uses of these compounds are described. The chapter also provides several treatment measures that could be utilized in case of poisoning caused by these compounds.