Trace Elements Concentrations in Water and Aquatic Biota from Ase Creek in Niger Delta

Water, Tilapia zilli , Synodontis nigrita , Clarias angillaris , Ipomoe cearri and Eichornnia natans samples collected from Ase-creek for a period covering ten months (January \u2013 October, 2006). The aforementioned samples were analysed for heavy metals such as selenium, arsenic, chromium, lead, molybdenum, bismuth and cadmium using atomic absorption spectrophotometry (AAS) of model Pye Unicam 2900. The results obtained revealed that there were metal variations and elevated concentrations were obtained except for arsenic which was below detection limit in fish samples. These elevated metal concentrations determined indicate a deep pollution of the Ase-creek. Metal concentrations in the fish species and aquatic plants in this study are good indicators for environmental monitoring in Nigerian rivers. Oil explorations, industries and anthropogenic wastes were traceable to the elevated metal concentrations in the Ase-creek

Heavy metals concentrations in coal and sediments from River Ekulu in Enugu, Coal City of Nigeria

The levels of some heavy metals such as; Mn, Cr, Cd, As, Ni, and Pb were analysed in coal and sediment samples from River Ekulu in Enugu, Coal City using Atomic Absorption Spectrophotometer (AAS) model Spectra-AA-10 variant. Mean concentrations of Mn (0.256-0.389mg/kg) and Cr (0.214-0.267 mg/kg) are high relative to concentrations of Cd (0.036-0.043 mg/kg), As (0.016-0.018 mg/kg), Ni, (0.064-0.067 mg/kg) and Pb (0.013-0.017 mg/kg). Except for Mn, there is a steady decrease in the concentration of all metals from November to March corresponding to decreasing run-off. Metal concentrations are generally higher in the coal samples than in the sediments. Selectiveleaching of these metals is suspected from the trends of their concentration. Seasonal fluctuations are higher in the sediments than the coal samples. Correlation coefficients show that all the metals are positively correlated with each other implying that they are from the same source or origin. The presence of toxic metals in the area is established, calling for the assessment of their impact on the health of human and aquatic lives around the area. @JASE

Heavy metals concentrations in coal and sediments from River Ekulu in Enugu, Coal City of Nigeria

The levels of some heavy metals such as; Mn, Cr, Cd, As, Ni, and Pb were analysed in coal and sediment samples from River Ekulu in Enugu, Coal City using Atomic Absorption Spectrophotometer (AAS) model Spectra-AA-10 variant. Mean concentrations of Mn (0.256-0.389mg/kg) and Cr (0.214-0.267 mg/kg) are high relative to concentrations of Cd (0.036-0.043 mg/kg), As (0.016-0.018 mg/kg), Ni, (0.064-0.067 mg/kg) and Pb (0.013-0.017 mg/kg). Except for Mn, there is a steady decrease in the concentration of all metals from November to March corresponding to decreasing run-off. Metal concentrations are generally higher in the coal samples than in the sediments. Selectiveleaching of these metals is suspected from the trends of their concentration. Seasonal fluctuations are higher in the sediments than the coal samples. Correlation coefficients show that all the metals are positively correlated with each other implying that they are from the same source or origin. The presence of toxic metals in the area is established, calling for the assessment of their impact on the health of human and aquatic lives around the area. @JASE

Trace Elements in Sediments of Selected Gutters and Bar \u2013 Beach, Lagos, Nigeria

Sediment samples were collected from selected gutters and Lagos bar beach for the investigation of trace element concentrations. The metals investigated were chromium, lead, arsenic, selenium, cadmium and barium using the atomic absorption spectrophotometry. The results obtained further revealed elevated concentrations metals from both selected gutters and the Lagos bar beach. It was also observed that the Lagos bar beach is the receiving end of all the pollution loads arising from the channeled gutters. These elevated trace element concentrations obtained in sediment in this study were compared with other similar studies. The sediment contaminations by metals were traceable to industries and anthropogenic substances in Lagos metropolis

Heavy metal content in the African giant snail Archachatina marginata (Swainson, 1821) (Gastropoda: pulmonata: achatinidae) in Southern Nigeria

Heavy metal concentrations in the African giant snail Archachatina marginata (Swainson) from nine localities in southern Nigeria ranged from 0.77 to 7.51 mg kg–1 Pb; 3.06–46.9 mg kg–1 Fe; 0.03–0.40 mg kg–1 Ni; 0.04–0.12 mg kg–1 Cu; 0.71–4.51 mg kg–1 Co; 0.67–1.27 mg kg–1 Mn; 0.99–3.28 mg kg–1 Cd; 0.08–0.22 mg kg–1 Zn; Cr was below the limit of detection. Concentrations of Pb, Fe, Ni, Cu, Co, Cd and Zn in the snail tissue varied significantly (95% confidence limit) between the localities. No significant variation was observed in the concentrations of Cr and Mn. Pb and Cd concentration exceeded the statutory safety limits for these elements in meat. The results indicate a heavy metal pollution of the habitats

Trace Elements in Sediments of Selected Gutters and Bar – Beach, Lagos, Nigeria

Sediment samples were collected from selected gutters and Lagos bar beach for the investigation of trace element concentrations. The metals investigated were chromium, lead, arsenic, selenium, cadmium and barium using the atomic absorption spectrophotometry. The results obtained further revealed elevated concentrations metals from both selected gutters and the Lagos bar beach. It was also observed that the Lagos bar beach is the receiving end of all the pollution loads arising from the channeled gutters. These elevated trace element concentrations obtained in sediment in this study were compared with other similar studies. The sediment contaminations by metals were traceable to industries and anthropogenic substances in Lagos metropolis

Trace Elements Concentrations in Water and Aquatic Biota from Ase Creek in Niger Delta

Water, Tilapia zilli , Synodontis nigrita , Clarias angillaris , Ipomoe cearri and Eichornnia natans samples collected from Ase-creek for a period covering ten months (January – October, 2006). The aforementioned samples were analysed for heavy metals such as selenium, arsenic, chromium, lead, molybdenum, bismuth and cadmium using atomic absorption spectrophotometry (AAS) of model Pye Unicam 2900. The results obtained revealed that there were metal variations and elevated concentrations were obtained except for arsenic which was below detection limit in fish samples. These elevated metal concentrations determined indicate a deep pollution of the Ase-creek. Metal concentrations in the fish species and aquatic plants in this study are good indicators for environmental monitoring in Nigerian rivers. Oil explorations, industries and anthropogenic wastes were traceable to the elevated metal concentrations in the Ase-creek