HEAVY METAL CONCENTRATIONS IN AUTOMOBILE WASTE DUMPS IN PORT HARCOURT SOUTHERN NIGERIA
(1) Williams, Esther Samuel (2) Etukudoh, Ndarake Emmanuel (3) Wenibo Andrew
1, 2, 3, Department of Crop/Soil Science, Faculty of Agriculture, Rivers State University of science and Technology, P.M.B 5080, Port Harcourt, Rivers State
Waste generated by automobile industry are known to contained toxic chemicals (grease, acid, organic solvent, suspended solids, cyanide, heavy metals etc) which are hazardous to both plants and animals. These wastes are dumped in an environment without proper detoxification treatments. An objective of this study was to assess heavy metals concentrations in the automobile dump sites in the Port Harcourt metropolis. Results indicated a low soil pH ranges with the highest pH values obtained in the reference point (0-30cm) soil depth and a significant build-up of lead (Pb), Zinc (Zn), copper (W), cadmium (Cd), chromium (Cr) and Nickel (Ni) in the impact zone as compared to reference point at P<0.05s. Heavy metal concentrations were higher in the surface than in the subsurface soils and decrease with distance and in soil depth away from the impacted zones and positively correlated with pH. The highest Pb (614), Cu (424.20), Zn (505.25) and Ni (2010) were observed in mile 3 (MIT), while the highest Cd (46), Cr (21.60) were obtained at east west road (EWR) and in the Port Harcourt Township (PHT) respectively. This study suggests that peasants farming in the automobile waste dump sites should be totally discouraged because crops raised on the soil might have elevated concentrations of some these heavy metals.
Key words: Detoxification, Anthropogenic, Trace, Heavy, Metals, Remediation, Impact.