Environmental Chemistry - Science topic
Environmental chemistry is the scientific study of the chemical and biochemical phenomena that occur in natural places. It can be defined as the study of the sources, reactions, transport, effects, and fates of chemical species in the air, soil, and water environments; and the effect of human activity on these
Questions related to Environmental Chemistry
I'm modeling an aspen model for wastewater treatment and in the model it allows me only to specify the component concentrations while I only have the COD for it is there any way to convert the COD into a concentration??
The effects of fluorine on the cycling of calcium, magnesium, and potassium in pine plantations of Eastern North Carolina.
Author: Wheeler, Garland Laurin, 1941-
Published: Raleigh, N. C., 1972.
Description: 67 ¾. illus. 29 cm.
Format: Theses and Dissertations
For some poeple Plastic Road is highly hazardous, especially for aquatic animals and birds. When plastics are exposed to sunlight and especially heat, they begin to turn into a harmful health element called microplastics. This harmful element is absorbed into the soil and has the ability to accumulate toxic substances around it.
(Should the research in environmental chemistry, green chemistry, materials chemistry, inorganic chemistry, analytical chemistry and other related chemistry areas be now further accelerated?)
Please, Could any one suggest for me a journal with rapid publication in the field of environmental science, health and pollution, a journal indexed in Web of Science, Scopus, low IF, and without fees, to publish my research paper.
The term "micropollutants" is used in many scientific papers. It seems like chemicals of emerging concern are often thrown into the micropollutant box. But how can a pollutant be classified as micro if chemicals are all quite microscopically small!
Are the users of the micropollutant buzz word not as guilty as the "heavy metals" fans? Fortunately a few papers have spoken out against the misuse of the term heavy metals (E.g. Duffus 2002, Pure and Applied Chemistry 74(5):793-807). Will micropollutants have their turn as well? :)
Hello! I'm studying environmental engineering and would like to find the latest strategies and developments for DNAPL remediation and investigation, but don't know where to start.
Are there any websites or publications I can start with?
Many thanks in advance!
I have measured the nitrogen content in the litter, and I want to calculate the ammonia emission using an equation.. can you help me in this point
Available nitrogen, phosphorus and potassium (NPK) content data are correlated applying with the multiple correlation coefficients formula, the obtained values are approaching 1 that indicates a strong positive relationships with each other, but each variable of the soil nutrients is considered to be dependent on the other variables changes, governed by the extraneous factors, that badly needs the regression fit line, but how could I couldn't find any formula for the calculation of the regression fit line for the multiple variables, is it available where two variables are independent and one is dependent, or is the regression fit line for the multiple variables relevant at all?
Mangroves have the ability to absorb up to four times more carbon dioxide by area than upland terrestrial forest ecosystems, carbon dioxide is stored as blue Carbon in the sediment of the mangroves swamps and marshes and green carbon in the soils of the terrestrial forest floors, and that carbon sink forms the carbon pool, but the result obtained from the analysis of the sediment samples of both types of ecosystems doesn't reflect that quantity, the organic carbon of the mangroves swamps ranges from 36 to 69%, whereas, the organic carbon content of the soils of the terrestrial forest ecosystems varies from 16 to 66%, then where and how the extra carbon stored in the mangroves sediments as blue Carbon which is four times more than that of the green carbon of the forest soil?
The content obtained for the C & N in the soil samples of the forest floors is increased this time and in 2020 is 5 times more than that of the C & N obtained in 2008, simultaneously the same forest stands in four districts is increased by areas observed in the India State of Forest Report 2019, not only that the forest canopy is much lush green in comparison to 2008, is this change be considered as the evidence of the climate change, though the time span of only 12 years is very short for interpretation of the evidence of the climate change.
After soil chemical analysis, obtained result for the content of organic carbon and nitrogen in kg/ha shows 0.00, whereas potassium content is 55.20 kg/ha for a surface soil sample collected in the Panagarh forest patches under the Bardhaman Forest Division of West Bengal, the soil was collected in the depth of 15 cm and the bulk density of the soil is 1.3 gm/cubic cm, visibly the sampled soil is the admixture of Alfisol and lateritic combination, is it possible for the soil sampled in the natural forests lacking both organic carbon and nitrogen, though the nature of forest vegetation is quite normal in the sampling spot?
I'm thinking of conducting an experiment with a solar photo-Fenton, but I'm in doubt about whether working with a reactor (using the chemical pollutant in large amounts, in flow) or if I work with the pollutant in Erlenmeyer's in the order of mL.
What would be more recommended?
I'm planning an experiment to pinpoint which chemical(s) from a group of 10 components is/are causing an observed ecological effect.
Unfortunately there is no data which chemical is more or less likely to be relevant.
(Edit: To avoid confusion, this is not a question about pollution in aquatic systems, but about odours causing a behavioural response.)
The plan is to have different mixes of the chemicals as my treatments. Each mix will contain eg 4 of the chemicals in different combinations.
The concentration of each component will be constant, the difference will just be a binary 0 or 1 whether it is present or not.
Question 1: Is there a name for this kind of procedure so that I can read up on it?
Question 2: Are there ways or best practices how to design my mixes, i.e. how many different ones and how many components in each.
Question 3: What would be the best way to analyze this? As far as I've read it could potentially be done with a logistic PCA, NMDS or SIMPER analysis, but I cannot figure out which one would be best.
I was invited to speaker into https://environmentalchemistry.chemistryconferences.org/
"Dear Sergio, Greetings! It is our honor to invite you as a Speaker for 21st International summit on Environmental Chemistry during August 19-20, 2020 which will be a webinar (Online Event). The conference includes oral, poster and video presentations. Also please be informed that, Our Editors of Industrial and Environmental Chemistry Journal are planning to release their upcoming issue, so kindly submit your manuscript/research article/abstract to get published in this journal. We are looking forward to your positive response. Regards, John Dixon| Program Manager Evironmental Chemistry2020 47 Churchfield Road London, W3 6AY, UK"
I never heard about this conference. I said yes and they wrote:
"Hi Sergio, I am very glad to hear from you. Firstly let me know your mode of participation as a speaker( oral, poster or video-presentation- where you can record your ppt and send it to us) or as a delegate (listener). i am waiting to hear from you. Regards John Dixon"
Now, Who is John Dixon?
I only found this reference on Linkedin https://www.linkedin.com/in/john-dixon-33a075103/
The profile picture shows a bunch of researchers but I believe he is not there.
Does anybody has experience with https://www.conferenceseries.com/?
And also, How much do I have to pay?
They wrote me with the following message:
"Hey!! Sergio, For video-presentation!! you need to send us your recorded video of your research topic which will be displayed on the day of conference where your research ideas can flourish in front of many other eminent researchers, students, business delegates and more.📷Waiting for your quick repl "
By the way, the wrote on twitter https://twitter.com/environmentchem lol
I checked the link and guess what, after the registration, I can proceed to payment... LMFAO, these guys have no shame!
I finally reply:
"Dear conference, I dont want to participate anymore. Best and get a real job"
Let us see what happens, my guess is that they will block me
during chemical analysis of groundwater of an industrial area, we found the concentration of fluoride in the range 0.15-0.32 mg/L, the pH of the water was found to be in the range 7.5-8.2 and bicarbonate alkalinity were found in the range 1000-5000mg/L.
please help me in this regard
The issue is that for many fresh water samples (not all) orthophosphate concentrations are slightly (for some samples more than slightly) higher than total P. For sample preservation I'm using HCl. Could that be the reason? Should I rather use H2SO4?
I have already tried eliminating arsenate, tried additional acidification and tried blowing the samples with nitrogen gas.
we have a double-chambered MFC that produced an OCV that reached 220 mV in 1 h, and was getting higher. after 24 hours the OCV dropped down, and I don't know why.
I want to measure the generated current first to plot the I-V curve, then the power density curve.
- Is the OCV drop because we didn't use an external resistance? when should we start applying it to the MFC? can someone explain it in details please.
- How to decide whether to use a fixed resistance over time, or to use a range of different resistances to carry out these measurements (I-V Curve, Power density Curve)?
I'm using a digital Multimeter for recording Voltage across either fixed or varied resistors.
I am PhD in analytical chemistry and I make part of a multidisciplinary team working on the development of a web based solution focusing mainly on treatment and management of environmental chemistry data. But in order be more acertive in this project I need to interview researchers worldwide to trace a more realistic picture on how they deal with their environmental data.
Could any of you please help me by giving me a 40 minute interview? We could make it via WhatsApp or Hangouts (or other choice).
Messages in private to more details are welcome!
Thank you all very much in advance.
I'm just trying to determine what's more crucial for my system. Supposedly, soil columns (allophanic) were loaded with wastewater with high initial P concentration prior. So if I were to pass 2 types of solution through the soil column, both with same ionic strength but one has high P concentration while the other has negligible P concentration. Which solution would cause desorption of P from the soil column?
I read in a book Environmental Chemistry that" in anoxic region of water bodies , some bacteria use sulfate ion as an electron receptor where as other bacteria reduce iron(III) to iron (II). These two products react to give a black later of iron (II) sulfide sediment. This frequently occurs during winter, alternating with production of calcium carbonate by product from photosynthesis during the summer. "
Can anyone help me understand why this phenomena occurs during summer and winter??
The aim of speciation procedures is to maintain the integrity of heavy metals species and minimise sample preparation procedures that may alter heavy metals speciaton. There is a tendency for laboratories to choose methods they are familiar with rather than the most appropriate procedures likely to obtain accurate and unambiguous speciation data.
Soil is an important source for heavy metals in crops and vegetables since the plants’ roots can absorb these pollutants from soil, and transfer them to seeds which through this can effect on humans, but what about soils in urban areas?
I have a solution contains Cobalt, Nickel, Manganese, Lithium and Iron. I want to measure the ferrous (Fe2+) concentration by potassium dichromate titration. Is mentioned elements affect the ferrous titration accuracy?
I want to extract soil nitrogen using KCL and use IC for analysis of Nitrate. In most of the protocols that I found so far 1 M KCL is used for extraction. However, IC's are not able to handle such high concentration of chlorides, neither are Hach kits. Any suggestion would be helpful to proceed further.
I am struggling to grind my samples to a fine powder, possibly because they have a very high sap/resin content. The samples have been freeze dried under vacuum, which should make them brittle but they are not!
So far I have tried:
- a Zirconium Oxide ball mill;
- Agate mortar and pestle and liquid nitrogen;
- inside an Orbital shaker in seal jars with glass balls;
- An Agate Mill mortar and pestle mill.
I can't proceed with the analysis until these samples are powdered, and I am running out of ideas and would appreciate any suggestions from people who have successfully powdered their samples.
Chromium occurs in the environment primarily in two valence states, trivalent chromium (Cr III) and hexavalent chromium (Cr VI). Exposure may occur from natural or industrial sources of chromium. .The motive behind the question is to get to know methods of removing chromium from waste water and other solid waste.
I am planning to do a research on the levels of mercury in waste water; mercury is known to be a persistent, bio-accumulative toxin, indicating that its toxicity does not diminish through decomposition or chemical reaction, and that it is absorbed faster than it can be excreted. Recently, efforts to minimise the release of mercury, and to track its migration when released, have demanded more sensitive analytical techniques for its measurement.
In environmental chemistry, the chemical oxygen demand (COD) test is commonly used to indirectly measure the amount of organic compounds in water. Most applications of COD determine the amount of organic pollutants found in surface water (e.g. lakes and rivers) or wastewater, making COD a useful measure of water quality. It is expressed in milligrams per litre(mg/L), which indicates the mass of oxygen consumed per litre of solution. But how could we estimate the amount of Organics by the COD of waste water? I wanna set up a calculation relationship between the organics content and wastewater COD.
I am using COD kits (Merck), with 25-1500 mg/L range. When I used low strength simulated textile effluent, cod values were obtained in the that range, but upon increasing the strength values fell out of the range i.e. > 1500. Therefore I diluted the samples (I have tried 10 and 20 times dilution) but the values I got are very high such as by diluting my samples 10 times I got the value 367 mg/L which means that the exact values should be 367 mg/L*10 = 3,670. I am getting such values even after complete decolorization of textile effluent (when the OD values for color fall below zero) but when I perform the cod test, values are very high. Please can anybody help about this? Am I doing it doing it wrong or is there any other solution for this?
Different groups favor different methods; I would greatly appreciate more input on the debate. Assume all bottle types are cleaned thoroughly and samples are being analyzed in the lab for Methylmercuy (MeHg), Total mercury (THg), both filtered and/or unfiltered. Other considerations: remote work, trace-level contamination, freezing vs. acidification.
My Problem:- I am working on ammonia sensor. I want to calibrate this sensor in a 1.2 L Airtight Chamber by Liquor Ammonia of 30% concentration and Specific Gravity 0.89.
So, What amount (in volume) of liquor ammonia is needed to achieve 1 ppm concentration of ammonia in chamber to calibrate the sensor.
Ammoin is very volatile hence I used a fan fitted in the chamber for better mixing of gas in chamber and also for total ammonia evaporation from the sample.
To make a calibration mixture for liquid ammonia, a known volume of liquid is vaporized in a known volume of dilutant air. The ideal gas law states that one gram mole of molecules will occupy 24,500 cc of volume at 25 degree centigrade and at 760 mm of mercury or sea level atmospheric pressure.
One part per million (by volume) is equal to a volume of a given gas mixed in a million volume of air.
1 ppm = (1 gas volume)/(〖10〗^6 air volumes)
A micro litre volume of gas in one litre of air would therefore be equal to 1 ppm:
1ppm= (1µL gas)/(1L air)
According to specification of liquor ammonia 30%
100mL liquor ammonia contains 30gm ammonia
Or, 1mL liquor ammonia contains 0.3gm ammonia
After dissolving 1mL liquor ammonia in 2499ml pure de-ionized water we obtained that:
2500mL liquor ammonia contains 0.3gm = 300mg ammonia
Or, 1mL liquor ammonia contains 1.2mg ammonia
Or, 1µl liquor ammonia contains 0.12µg ammonia
According to Standard Temperature and Pressure (STP) law
17 gm ammonia will occupy 24.5 Litre volumes
Or, 17µg ammonia will occupy 24.5 µL volumes
Or, 0.694µg ammonia will occupy 1 µL volume
Or, 0.833µg ammonia will occupy 1.2 µL volumes
We know that,
1ppm= (1µL gas)/(1L air)
And, We have an Airtight chamber of 1.2L volume
1ppm= (1.2µL gas)/(1.2L air)
Form above calculation we can derive an equation for ppm calculation for 1.2 liter gas.
liquor ammonia (µl)= (0.833 ×ppm ×dilution)/300
Therfore, If we take 7µL diluted (2500 times) liquor ammonia and placed in 1.2 L Airtight chamber
Then, We obtained 1ppm ammonia concentration in that chamber.
As people generally know that higher impact factor occupies higher Q1 rank. However, I noticed that " environmental science and pollution research has 2.80 impact factor and it is Q1 ranked, while "environmental chemistry letters has 3.18 IF but still Q2. why and what is the meaning of Quartiles within subject categories? advance thanks.
In CO2 photoreduction, in order to determine the order of reaction, it is important to know concentration change with time. how do we do that? i found a titration method using standard NaOH solution. this method can be used to know the initial concentration, but not the concentration in the middle of experiment. Is there any reference for a better/ accurate way to determine CO2 concentration. thank you
is anyone can help me to understand:
I have several questions related to Understanding by Design.
As a part of my writing thesis, UbD is one of recommendation good issue topic from my advisor to talk about, I start to get close to Understanding by Design and its workbook, try to apply to our class environmental chemistry which topic is Water treatment. However, I have difficulties to find who will be a validator for what we made several months ago. I made it based on what I read in the books, but I do not know yet whether it is correct or not. I got troubles in 1. validate the learning plan that we made
2. to measure student improvement whether they have the deeper understanding or not. what kind of test I need to give to student to measure the student's improvement?
I want to convert powdered activated carbon to pellets to use in a continuous adsorption process for the removal of Iron from contaminated water. In this regard Can you suggest binders which do not react with iron?
Dear researchers and professors
I have difficulty to determine the exact amount (kg/hr) of PZ, H2O, CO2 in LeanIN into absorber column. If the given values are following
PZ 5 m (molality (mol/kg H2O))
mol CO2/ mol alkalinity = 0.236
LeanIN flow rate is 3180 kg/hr?
My concern is mainly the right calculation method for the certain problem if anybody can be helpful?
I'm currently working on hydrocarbon contamination specifically BTEX in underground waters. I would like to know which chemical or solvent is best for the extraction of the water samples for the onward determination of Benzene, Toluene, Etylbenzene and Xylene concentration. Thanks
Determination of trace concentrations of phenol in aqueous solutions.
I want to calculate how much ammonia evaporates from a 10% ammonia solution (ammonium hydroxide solution), to check if the concentration of ammonia in the air exceeds 25 ppm. The temperature is 40°C. How can I also consider the pH regulation? Thanks in advance!
I am curious as a student of environmental chemistry and toxicology. Thank You!
Dear Researchers, I have prepared few research papers and I need the list of open access Scientific Journals of Environmental Science, Environmental Chemistry or Environmental Geology or which are related to assessment of heavy metals in different environmental samples.
Please suggest me the Journals having no publication fees or very low because I am an independent researcher and I dont have any source of funding from my institute.
I am using the standard in the form of mixture i.e EPA VOC Mix 2 (2000 microgram per ml each component in methanol). As mentioned in COA, it is having 14 components / analytes. When this particular mixture was run on HPLC, it did not give all 14 peaks of different components. It gave only one broader peak with some minute peaks. The mobile phase utilized was Acetonitrile : Deionized Water. Why separate peaks were not being identified? What should be done / Which parameter of HPLC should be altered so that separate peaks could be identified?
I'm trying to understand what laboratories in UK or any part of the world can offer in regards to biological monitoring of agents/pollutants specific to the food and beverage industry such as grain and flour dust, aerosol proteins, polycyclic aromatic hydrocarbons (PAH) , chlorine and hypochlorite used in cleaning and sanitizing, ammonia and sulphur dioxide used in refrigeration...etc
I'm looking for articles, laboratories contacts, researcher profiles, that can help me to answer the question.
I have a problem with my portable water treatment plant. Raw water is coming bad, ammonia, manganese and organic increasing day by day. So I'm finding some way to treat it.
Do anyone knows or have experience with chitosan as coagulation aid or to absorb metal?
thank you so much for all helps.
If I make a sodium arsenite solution with NaAsO2 in distilled water, later I want to measure the concentration using SDDC method, shall I preserve it with 1% nitric acid and refrigerate at 4o C? Will it hamper the arsine gas generation?
Suggest me with necessary links/papers.
We use Kjeldhal digestion to decompose organic matter. Using H2SO4 and H2O2 for digestion. But since we have a lot of samples, we are looking for colorimeter method to measure quickly the NH4, or (NH4)2SO4 in the solution, which its pH <1
Recently, i am working on the buffer capacity of soil colloid. Can anyone suggest me a method to determine the concentration of humic acid in soil colloid.
we have sulfate leakages into permeate in our SRS plant, what i want to know that how to reduce it, secondly if we need to make the cleaning then what type of chemicals and what procedure we need to adapt for cleaning of nano membranes......?
The pH of the media is 6-7, but both the anoxic and oxic zones of my reactor have a pH of 8-9. I've been trying to find information about this in research, but can't seem to find anything.
The media uses calcium chloride dihydrate at a concentration of 0.675g in 15L and magnesium sulfate heptahydrate at a concentration of 9g in 15L.
I'm new to wastewater microbiology and have limited experience with chemistry, so any help would be much appreciated.
In an optimization test of oleic acid dosage as a collector for silica sands beneficiation the recovery of heavy minerals increases as the oleic acid dosage increases reaching a turning point at 2 g/kg oleic acid dosage is that related to dissociation of oleic acid?
My name is Ferdinand.
I have sample from electroplating wastewater. It is colored blue (just like Copper solution)
I measure the sample with AAS and the result Copper (II) = 11,3455 ppm
then in the next 3 months I measure it again yet the result is 14,1960 ppm
my question is what happen to my sample?
before I measure it with AAS, I always shake the sample and make sure it is completely homogen.
does some reactions happened?
the pH =2,5
I store the sample in the HDPE plastic container, no sunlight exposure,
temperature at room temperature.
The sample was destructed with concentrated HNO3 before the measurement.
I need to analyze Al with UV using different pH and other recovered nutrients from sludge. I don't want to use ICP OES and Atomic absorption for Al measurements as ICP OES analysis is not appropriate due to high Na concentration.
My doctoral theme is the investigation of thermal waters composition, and how do they change during use as a pool water. During this work, I want to perform a detailed study on organic components.
I thought about measuring PAHs, humic acids, TPH and BTEX compounds, and low C number carboxylic acids.
Any idea what else could be interesting?