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Maximilian Obinna Obiakor

Maximilian Obinna Obiakor

About

45
Publications
10,901
Reads
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458
Citations
Citations since 2017
12 Research Items
318 Citations
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20172018201920202021202220230204060
20172018201920202021202220230204060
20172018201920202021202220230204060
Introduction

Publications

Publications (45)
Article
Full-text available
The rise in gaseous pollutants and particulate concentrations is a serious problem for the environment. This study examined the air quality within four urban areas (Awka, Ekwulobia, Nnewi, and Onitsha) in Anambra State, Nigeria. The concentrations of known air pollutants including suspended particulate matter (PM2.5and PM10), nitrogen dioxide (NO2)...
Article
Full-text available
We conducted acute toxicity studies using semi-static protocols to examine the lethal responses of Australian bass and silver perch exposed to antimony (Sb) oxidation states in Sb(III) (10.5–30.5 mg L⁻¹) and Sb(V) (95.9–258.7 mg L⁻¹). Bioavailability and the effects of Sb on body ion regulation (Na, Ca, Mg, and K) were also investigated. Antimony s...
Article
Antimony (Sb) is a priority water pollutant known to be toxic to aquatic organisms at high concentrations. Environmental exposure, however, occurs most often at sub-lethal concentrations but very limited information is available on effects of sub-lethal, chronic exposure to Sb, which hinders reliable risk assessment and the setting of protective gu...
Research
Full-text available
Maritime industry clustering has in recent years gained attention as a tool for strategic global and regional economic competitiveness policies owing to their co-location synergies and agglomeration economies. The Nigerian maritime sector is known to have a large maritime industry comprising shipping and logistics firms, shipyards, ship consultants...
Article
Full-text available
The public health risks associated with consumption of freshwater species potentially contaminated with metals at Otuocha, Ose and Atani landing sites in Anambra State, Nigeria were assessed. Species comprising seven fishes (Malapterurus electricus, Clarias gariepinus, Tilapia zillii, Gnathonemus tamandua, Citharinus citharus, Oreochromis niloticus...
Conference Paper
Full-text available
Purpose. Rapid urbanization and uncoordinated development of Africa in recent years are beginning to compromise the essential ecological assets and threaten the quality of public health. Since consistent air quality data rarely exists in Nigeria, the study therefore examined the air quality conditions of four urban areas in Anambra State, determini...
Article
Full-text available
Antimony (Sb) is increasing in the environment but effects of exposure in ecosystems are not well understood. The aim of this work was to examine effects of antimony exposure on the multifunctional, plant growth promoting, ubiquitous soil bacterium Azospirillum brasilense Sp7. Contaminated mine water with high Sb concentrations (0.13 ± 0.09 mg L⁻¹)...
Article
This article reviews relevant literature on antimony (Sb) bioaccumulation, trophodynamics and ecotoxicity in freshwater environments, and identifies current information gaps. Both autotrophs and heterotrophs can bioaccumulate Sb, and elevated concentrations in tissues are mostly associated with anthropogenic sources. The degree of bioaccumulation i...
Article
River Niger is the third-longest river in Africa and the longest river in West Africa. The river basin traverses West and Central African countries, and forms a coastal delta (in southern Nigeria) where it empties into the Atlantic Ocean. The River Niger Basin (RNB) is a crucial asset to development of the West and Central Africa subregions. The RN...
Article
Full-text available
Antimony (Sb) is a pollutant in many jurisdictions, yet its threat to aquatic biota is unclear. Water quality guidelines (WQGs) for Sb are not well established and large uncertainty factors are commonly applied in derivation. We constructed freshwater species sensitivity distributions (SSDs) for Sb(III) using available acute toxicity data sourced f...
Article
Full-text available
Background Elevated arsenic and trace metal contamination of the terrestrial food chain represents one of the most significant environmental risk exposures for human populations in developing countries. Metalloid and metal contamination in horticultural crop produce such as fruit is a public health concern in Nigeria. Local fruits are cheap sources...
Article
Background. Elevated arsenic and trace metal contamination of terrestrial food chain represents one of the most significant environmental risk exposures for human populations in developing countries. Metalloid and metal contamination in horticultural crop produce such as fruit is a public health concern in Nigeria. Local fruits are cheap sources of...
Article
Trace metal (Zn, Pb, Cu, Cr and Cd) concentrations in the water column and in the liver, muscle and gill tissues of Parachanna obscura and Clarias gariepinus in Agulu Lake, Nigeria, were investigated in June 2014 and compared with WHO and FAO safe limits for water and fish. Hazard index (HI) values were estimated to assess the potential public heal...
Article
A significant number of studies have centred on the single actions of heavy metals against test animals in predicting aquatic toxicity. However, practical existence of environmental toxicants is in multiple mixtures and variable undefined ratio combinatorial concentrations. Pollution abatement approaches in setting representative safe boundaries fo...
Article
Full-text available
Aim: Contamination of the Anambra River with heavy metals (arsenic, As; cadmium, Cd; chromium, Cr; copper, Cu; lead, Pb; nickel, Ni; and zinc, Zn) was examined in two preponderant fish species (Synodontis clarias and Tilapia nilotica) following earlier detection of the elements in water column. Methods: Levels of heavy metals were measured in both...
Conference Paper
Full-text available
Anthropogenic activities have been the major contributory sources of heavy metals accumulation in aquatic ecosystems above the background concentrations. Contamination of the Anambra River with heavy metals (Cr, Cd, As, Zn, Pb, Ni, and Cu) was examined in preponderant fish species following earlier detection of the elements in water column. The che...
Article
Polycyclic aromatic hydrocarbons (PAHs) present in water column and preponderant fish species of Anambra River were conducted. Eight PAHs (naphthalene, acenaphthene, fluorine, phenanthrene, anthracene, pyrene, fluoranthene and benzo [a] pyrene) classified as priority pollutants by the United States Environmental Protection Agency and World Health O...
Article
Pollution of freshwater ecosystems is alarmingly becoming high in Nigeria with attendant public health effects on the dependent populations. Fish, a source of protein with pronounced placement on local food menu is now considered an important dietary threat of heavy metal toxicity via consumptions. Bioaccumulation of heavy metals (copper, zinc and...
Article
Aquatic ecosystem pollution by heavy metals is a global problem and requires proactive measures and techniques in tackling the scourge. Exposure to multiple contaminants in water environment now displaces the single action of pollutants and creates a challenge for complex mixture contact management. Heavy metals at individual low acting concentrati...
Article
The shale boom is on course to make the U.S. the world‘s largest oil producer by 2017.Dependence on OPEC‘s crude is slipping as the U.S. and Canada unlock unconventional oil supplies from deep underground shale deposits with new drilling techniques- the fracking or hydraulic fracturing. The Nigerian economy with 80% dependency on crude is going to...
Article
Anambra River is the largest river in Anambra State. The river has suffered drastic changes from the pollution of its water for the past years. The physicochemical properties of the river were determined using standard methods for examination of water and wastewater. Consequently, the heavy metal content of the water was also investigated at four d...
Article
For a sustainable environmental future, the world ecosystem needs to be free of toxic residues. A bioprospecting strategy involving comparative analysis on the efficacy of neem aqueous extract and a synthetic insecticide in the control of termites was experimented. Soldier and Worker castes were exposed to aqueous neem extract and insecticide treat...
Article
Following the toxicity and potential risk posed by the heavy metals to man and aquatic ecosystems, the study investigates the adverse changes exerted by sublethal concentrations of triple mixture of heavy metals (Cd, Cr, and Pb) on the glycogen and vitamin E reserves of tilapia species, Oreochromis niloticus over an exposure period of 1, 10, 20, an...
Article
Niger Delta has been an ugly centre of oil exploration and production for decades in Nigeria by different multinational oil companies. The biodiversity rich wetland is grossly polluted without definite stand as to who bears the responsibility of its pollution. Foreign oil companies and the indigenous operational towns had traded blames as to the ma...
Article
Biotoxicity of two plant powders; Piper guineense (Schum and Thonn) and Zingiberofficinale was investigated to ascertain their efficacies as sustainable and eco-friendly pesticides against fish beetles, Dermestes maculates. Eight dosages, 0.02, 0.04, 0.06, 0.08, 0.05, 1.0, 1.5 and 2.0 all in grams (g) were used in the assay and larval and adult mor...
Article
Water samples from the Anambra River were taken from five distinct locations that displayed differential environmental stress to evaluate freshwater pollution. The physico-chemical characteristics of the river were conducted. The distribution and occurrence of heavy metals, which may affect human health and possibly induce aquatic damage, were inve...
Article
The acute toxicity of Alkylbenzene Sulphonate (Surfactant) detergent, a household cleaning agent to Clarias gariepinus fingerlings was investigated and assessed using static bioassay with the aim of ascertaining their level of tolerance in freshwater ecosystems. The fish specimens with mean body weight of 6.5 ± 1.3g and standard length of 6-8 cm we...
Article
Meningococcal infection has been recognized as a serious problem for almost 200 years. Cerebrospinal or Meningococcal meningitis (MCM) can occur as a sporadic case, institution based focal outbreak, or a large epidemic year. The distribution of serogroups causing meningococcal disease (A, B, C, Y, W-135) varies over time and by geographic location...
Article
Epiphytic cryptogams are increasingly gaining relevance in environmental monitoring. Because of their naturally unique ion-exchange mechanisms, they can conveniently absorb and bio accumulate elements in their systems. Foliose-type of lichens is observed to be highly tolerant and reflect the history of the resident environment over time. Heavy meta...
Article
Heavy metal pollution has been a major concern to the society. The rate of exposure to this pollutant is alarmingly on the increase with its attendant public health risk. The aim of the study was to investigate the atmospheric deposition of heavy metals in an important semi-industrialized and sparsely populated area of Okpuno Awka, Southeastern Nig...
Article
The present paper shows the considerable impacts of both vegetated and synthetic surfaces on the microclimate of urban area. Vegetation of a particular place affects the microclimate through reduced solar radiation and lower air temperature due to shading and evapotranspiration. Lower air temperatures are essential both to improve thermal comfort c...
Article
Effect of inclusion of mushroom (Pleurotus cystidiosus) to substitute lysine in the diet of broiler chicks was investigated. The study lasted for a period of twelve weeks. Twenty four broiler chicks were subjected to two different dietary treatments (Diet I contained 0.22% of mushroom while Diet II contained 0.22% of synthetic Lysine and was use...
Article
Full-text available
The application of fish erythrocyte micronucleus assay in pollution monitoring-particularly in water has been described as sensitive biodetector of genotoxicants. The pervasiveness of this technique has been characterized by varieties of sensitivities and adequacies in forms of early warning of eco-damage and toxicity, stresses on the health of org...
Data
The application of fish erythrocyte micronucleus assay in pollution monitoring-particularly in water has been described as sensitive biodetector of genotoxicants. The pervasiveness of this technique has been characterized by varieties of sensitivities and adequacies in forms of early warning of eco-damage and toxicity, stresses on the health of org...
Article
Full-text available
Acute toxicity of zinc (ZnSO4.7H2O) on Clarias gariepinus (Burchell, 1822) was investigated using toxicity scale of 96hrLC50 values and the quantal response determined by the statistical Probit Analysis Method. Fish species displayed different mortality responses to the varying concentrations of zinc studied (50, 60, 70, 80, 100 and 120mg/l) 96-...
Article
Full-text available
Incidence of chromosomal aberrations in Synodontis clarias and Tilapia nilotica (Linnaeus 1757) were measured using the conventional micronucleus assay in fish erythrocytes. The species showed varying degree of micronuclei frequencies in their respective genomes of sampled gill and kidney blood. Cytological examinations showed bi-nucleated cells...
Article
Full-text available
Lethal effects of zinc sulphate (ZnSO4.H2O), a widespread environmental pollutant was evaluated following exposure at different concentrations of the toxicant to Tilapia species, Oreochromis niloticus based on toxicity index of 96 hrs LC50 values. The obtained results were analyzed by the Finney’s Probit Analysis LC50 Method and 96 hrs LC50 valu...
Article
Acute toxicity of copper sulphate (CuSO4.5H2O) to tilapia (Oreochromis niloticus) and catfish (Clarias gariepinus) species was investigated using toxicity index of 96 hours LC50 and the quantal response determined by the statistical probit analysis method. In response to the lethality of the copper toxicant, behavioral anomalies (locomotor respon...
Article
Full-text available
The genotoxicity of copper, zinc and their binary mixture was examined inSynodontis clarias and Tilapia nilotica using the sensitive micronucleus assay in fish genome. Increased formation of the micronuclei were observed in all the three concentrations studied (0.25LC50, 0.125LC50 and 0.0625LC50). The frequency of micronuclei was observed to increa...
Data
River Oyi has been under drastic pollution stress of its water and requires extensive monitoring using sensitive biomarkers. Genotoxic alterations induced by River Oyi were investigated based on the karyomorphological analysis and micronucleus assay in Clarias gariepinus exposed to its water for 10 and 28 days, respectively. A standard control expe...
Article
Full-text available
Karyological and Chromosome analysis of Clarias gariepinus (Burchell, 1822) inhabiting Ananmbra River, Anambra State of Nigeria was carried out using Modified Air-drying technique. Clarias gariepinus was found to have standard karyotype and diploid chromosome number of 2n = 56. The study further revealed that the males and females catfish consist o...
Article
Full-text available
Karyological and Chromosome analysis of Clarias gariepinus (Burchell, 1822) inhabiting Ananmbra River, Anambra State of Nigeria was carried out using Modified Air-drying technique. Clarias gariepinus was found to have standard karyotype and diploid chromosome number of 2n = 56. The study further revealed that the males and females catfish consist o...

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