After graduation in 1990, I did NYSC in Government Science School, Wukari in Taraba State in 1991. Got a lecturing job at the Cross River State College of Education Akamkpa in 1992. Started M.Sc in 1994, accepted a contract job with the ALSCON Ltd. at Ikot Abasi in AKS. This was to enable me do my research in the company's lab facility, got the M.Sc in 2003. Obtained a scholarship from govt of CRS to do a PhD in Analytical (Environmental) Chemistry in Krasnadar, Russian Federation in 1994. Obtained the PhD in 2009. Have been lecturing to date. with more than 41 publications in Academic (Scientific) Journals. Currently the HOD of Chemistry Department Cross River University of Technology (CRUTECH) Calabar, CRS, Nigeria.
The present study is focused on the assessment of the level of bioaccumulation tendency of heavy ... more The present study is focused on the assessment of the level of bioaccumulation tendency of heavy metals in Crab (Brachyura) and Prawn (Panaeus monodon) from Esierebom Beach in Calabar South Local Government Area, Cross River State. The physico-chemical parameters of water were found to be as follows: pH (6.34); Dissolve oxygen (1.92); Conductivity (0.1µs/cm) and Temperature (26.85 o c). The moisture content of Prawn and Crab were found to be 38.00% and 56.00% respectively. Atomic Absorption Spectrophotometer was used to analyse the level of bioaccumulation of selected heavy metals. The result showed that the concentration of heavy metals varies thus difference was found between the concentration of As and Hg but Pb was found to be significantly higher than the WHO acceptable limit of intake. This study revealed that Crab shows a higher bioaccumulation tendency compared to prawn. The presence of higher Pb concentration can pose serious hazard to the organism and the environment. This is attributed to the high anthropogenic activities in the area under study.
This research was carried out to assess heavy metals pollution in Makurdi auto-mechanic dumpsites... more This research was carried out to assess heavy metals pollution in Makurdi auto-mechanic dumpsites in Kanshio (K), Northbank (NB) and Wadata (W). Atomic absorption spectrophotometer (PG990) was used to determine the heavy metals concentration. Results of the mean heavy metals concentrations (Cd, Cu, Pb and Zn) were found to be K (4.65, 137.12, 257.77 and 294.75), NB (1.97, 65.67, 162.88 and 223.23), and W (2.92, 85.27, 187.20 and 262.00 mg/kg), respectively, they were higher than their referenced maximum permissible level in the soil when compared to World Health Organization (WHO), United States Environmental Protection Agency (USEPA), Mean Shale Concentration (MSC) and World Surface Rock Average (WSRA) guidelines, indicating high level pollution. The high level of Cu, Pb and Zn, may be due to waste from welding activities, lead (Pb) battery repairs and coatings done in these area. The geo-accumulation index for Cd and Pb for the three dumpsites was found to exhibit moderately to s...
International journal of scientific and research publications, 2018
ABSTRACT: This study has its objectives of assessing the levels of polychlorinated biphenyls in f... more ABSTRACT: This study has its objectives of assessing the levels of polychlorinated biphenyls in five soil samples collected from the effluent channel of petroleum product tank farm in Calabar Jetty, Cross River State. The five soil samples were subjected to analytical procedure by extracting with nhexane/acetone mixture volume (1:1). The extracts were distilled at 56C to remove acetone and the residue from each extract was mixed with 20ml of distilled water and separated with a separatory funnel. The hexane phase was collected from each sample and the clean-up process was carried out using florisil column prepared according to slurry packing technique (1cm x 25cm glass column containing 5.0g florisil, 60100mesh, conditioning for 4hrs at 250C) then deactivated with 5% water by weight, with a layer of anhydrous sodium sulphate on top to remove interferences before they were analyzed and quantified using GC-ECD/MS instrumentation. The results revealed presence of PCBs in all the sample...
Advanced computational tools allowed to study a pure commercial sample of dichlorodiphenyltrichlo... more Advanced computational tools allowed to study a pure commercial sample of dichlorodiphenyltrichloroethane (DDT) prepared in liquid phase in KBr pellets and characterized using FT-IR and GC-MS followed by the application of DDT for molecular docking against human estrogen receptor alpha. The compound was modelled using GaussView software. Using Veda 04 program, the theoretical vibrational energy distributions and experimental vibrational frequencies were compared. Interestingly, C1 and C2�possess the highest atomic charge density distribution (ACDD)�of -0.284e and -0.283e while C21 and C11 have lowest ACDD of -0.064e and -0.063e in a relative manner, since the deactivating power of chlorine atoms decreases charge densities of the bonded carbon. The highest intramolecular interacting perturbation energy is 1121.92 kJ mol�1 occurs between ?*C19�C21 donor orbital and ?*C14�C16 acceptor orbital while the least intramolecular interaction occurs in the lone pair of LPC26 and the�sigma nonb...
The ground water quality of Okobo Local Government Area was investigated. Sixteen boreholes (BHs)... more The ground water quality of Okobo Local Government Area was investigated. Sixteen boreholes (BHs) water samples were collected from four zones (Okopedi, Ekeya, Ukwong and Okiuso) in Okobo. Standard analytical procedures were used to analyze the physicochemical, bacteriological and heavy metal parameters in the water samples and the results compared to Nigerian standard for drinking water quality (NSDWQ). some physicochemical parameters investigated were within the acceptable limits set by NSDWQ except pH (5.99 ± 0.37), DO (0.31 ± 0.06) mg/L, BOD5 (6.26 ± 0.4) mg/L and Nitrate (62.53 ± 5.96) mg/L. Bacteriological parameter like fecal coliform (128.69 ± 31.40) MPN/100 mL and total coliform (287.63 ± 40.31) MPN/100 mL were also above the limits set by NSDWQ implying organic pollution due to fecal contamination. Heavy metals were also within the acceptable limit except Lead (0.1 ± 0.1) mg/L, Chromium (0.4 ± 0.2) mg/L, and Manganese (0.16 ± 0.2) mg/L which were slightly above acceptable ...
Surface soil samples at depth of 0-15cm were collected from the Arufu Pb-Zn mining district withi... more Surface soil samples at depth of 0-15cm were collected from the Arufu Pb-Zn mining district within the Middle Benue Trough for this study. The aim was to determine the levels and spatial variability of heavy metals in the surface soil as well as the factors controlling the overall pattern of surface soil variability in the mining district. The soil samples were digested with 4M HNO3 and analysed for Fe, Zn, Mn, Cu, Pb, Cr, Cd, As and Ag using tomic absorption spectrophotometer (AAS) model 210. Organic matter content (OM) and pH of the soil samples were also determined. The resulting data was subjected to both descriptive and factor analyses. Results showed elevated levels of trace metals (Pb, Zn and Cd) and erratic distribution of trace metals in the surface soil. The factor analysis in R-mode was used to integrate the geochemical data. Factor 1 revealed the significant lithologic controls through oxidation of bedrock and sulphide minerals, as well as environmental controls through ...
The present study is focused on the assessment of the level of bioaccumulation tendency of heavy ... more The present study is focused on the assessment of the level of bioaccumulation tendency of heavy metals in Crab (Brachyura) and Prawn (Panaeus monodon) from Esierebom Beach in Calabar South Local Government Area, Cross River State. The physico-chemical parameters of water were found to be as follows: pH (6.34); Dissolve oxygen (1.92); Conductivity (0.1µs/cm) and Temperature (26.85 o c). The moisture content of Prawn and Crab were found to be 38.00% and 56.00% respectively. Atomic Absorption Spectrophotometer was used to analyse the level of bioaccumulation of selected heavy metals. The result showed that the concentration of heavy metals varies thus difference was found between the concentration of As and Hg but Pb was found to be significantly higher than the WHO acceptable limit of intake. This study revealed that Crab shows a higher bioaccumulation tendency compared to prawn. The presence of higher Pb concentration can pose serious hazard to the organism and the environment. This is attributed to the high anthropogenic activities in the area under study.
This research was carried out to assess heavy metals pollution in Makurdi auto-mechanic dumpsites... more This research was carried out to assess heavy metals pollution in Makurdi auto-mechanic dumpsites in Kanshio (K), Northbank (NB) and Wadata (W). Atomic absorption spectrophotometer (PG990) was used to determine the heavy metals concentration. Results of the mean heavy metals concentrations (Cd, Cu, Pb and Zn) were found to be K (4.65, 137.12, 257.77 and 294.75), NB (1.97, 65.67, 162.88 and 223.23), and W (2.92, 85.27, 187.20 and 262.00 mg/kg), respectively, they were higher than their referenced maximum permissible level in the soil when compared to World Health Organization (WHO), United States Environmental Protection Agency (USEPA), Mean Shale Concentration (MSC) and World Surface Rock Average (WSRA) guidelines, indicating high level pollution. The high level of Cu, Pb and Zn, may be due to waste from welding activities, lead (Pb) battery repairs and coatings done in these area. The geo-accumulation index for Cd and Pb for the three dumpsites was found to exhibit moderately to s...
International journal of scientific and research publications, 2018
ABSTRACT: This study has its objectives of assessing the levels of polychlorinated biphenyls in f... more ABSTRACT: This study has its objectives of assessing the levels of polychlorinated biphenyls in five soil samples collected from the effluent channel of petroleum product tank farm in Calabar Jetty, Cross River State. The five soil samples were subjected to analytical procedure by extracting with nhexane/acetone mixture volume (1:1). The extracts were distilled at 56C to remove acetone and the residue from each extract was mixed with 20ml of distilled water and separated with a separatory funnel. The hexane phase was collected from each sample and the clean-up process was carried out using florisil column prepared according to slurry packing technique (1cm x 25cm glass column containing 5.0g florisil, 60100mesh, conditioning for 4hrs at 250C) then deactivated with 5% water by weight, with a layer of anhydrous sodium sulphate on top to remove interferences before they were analyzed and quantified using GC-ECD/MS instrumentation. The results revealed presence of PCBs in all the sample...
Advanced computational tools allowed to study a pure commercial sample of dichlorodiphenyltrichlo... more Advanced computational tools allowed to study a pure commercial sample of dichlorodiphenyltrichloroethane (DDT) prepared in liquid phase in KBr pellets and characterized using FT-IR and GC-MS followed by the application of DDT for molecular docking against human estrogen receptor alpha. The compound was modelled using GaussView software. Using Veda 04 program, the theoretical vibrational energy distributions and experimental vibrational frequencies were compared. Interestingly, C1 and C2�possess the highest atomic charge density distribution (ACDD)�of -0.284e and -0.283e while C21 and C11 have lowest ACDD of -0.064e and -0.063e in a relative manner, since the deactivating power of chlorine atoms decreases charge densities of the bonded carbon. The highest intramolecular interacting perturbation energy is 1121.92 kJ mol�1 occurs between ?*C19�C21 donor orbital and ?*C14�C16 acceptor orbital while the least intramolecular interaction occurs in the lone pair of LPC26 and the�sigma nonb...
The ground water quality of Okobo Local Government Area was investigated. Sixteen boreholes (BHs)... more The ground water quality of Okobo Local Government Area was investigated. Sixteen boreholes (BHs) water samples were collected from four zones (Okopedi, Ekeya, Ukwong and Okiuso) in Okobo. Standard analytical procedures were used to analyze the physicochemical, bacteriological and heavy metal parameters in the water samples and the results compared to Nigerian standard for drinking water quality (NSDWQ). some physicochemical parameters investigated were within the acceptable limits set by NSDWQ except pH (5.99 ± 0.37), DO (0.31 ± 0.06) mg/L, BOD5 (6.26 ± 0.4) mg/L and Nitrate (62.53 ± 5.96) mg/L. Bacteriological parameter like fecal coliform (128.69 ± 31.40) MPN/100 mL and total coliform (287.63 ± 40.31) MPN/100 mL were also above the limits set by NSDWQ implying organic pollution due to fecal contamination. Heavy metals were also within the acceptable limit except Lead (0.1 ± 0.1) mg/L, Chromium (0.4 ± 0.2) mg/L, and Manganese (0.16 ± 0.2) mg/L which were slightly above acceptable ...
Surface soil samples at depth of 0-15cm were collected from the Arufu Pb-Zn mining district withi... more Surface soil samples at depth of 0-15cm were collected from the Arufu Pb-Zn mining district within the Middle Benue Trough for this study. The aim was to determine the levels and spatial variability of heavy metals in the surface soil as well as the factors controlling the overall pattern of surface soil variability in the mining district. The soil samples were digested with 4M HNO3 and analysed for Fe, Zn, Mn, Cu, Pb, Cr, Cd, As and Ag using tomic absorption spectrophotometer (AAS) model 210. Organic matter content (OM) and pH of the soil samples were also determined. The resulting data was subjected to both descriptive and factor analyses. Results showed elevated levels of trace metals (Pb, Zn and Cd) and erratic distribution of trace metals in the surface soil. The factor analysis in R-mode was used to integrate the geochemical data. Factor 1 revealed the significant lithologic controls through oxidation of bedrock and sulphide minerals, as well as environmental controls through ...
Uploads
Conference Presentations by Peter Neji
Papers by Peter Neji