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IJASRR Abstract

Distribution of Heavy Metals on Soils of Solid Waste Dump Sites in Port Harcourt Rivers State, Nigeria

*Elenwo, Ephraim Ikechukwu and Alloh, Akpobome Divine

Department of Geography and Environmental Management, Faculty of Social Sciences University of Port Harcourt, P.M.B.5323, Choba, Rivers State, Nigeria.

Accepted March 19, 2016

The study experimentally examined physico-chemical properties of soil in selected dumpsites (Eliozu, Iwofe and Igwuruta) in Port Harcourt Metropolis. Soil samples were collected in labelled polythene bags and taken to laboratory for analyses. Three leachate samples were randomly collected from the dumpsites into a labelled, sterilised plastic container and taken to laboratory for analyses. Descriptive statistics and inferential statistics (ANOVA) were used. Results showed soil pH was more acidic in the dumpsites than control plot. Findings showed sand dominated the particle size and highest sand content at topsoil (0-15cm). Analysis showed soil pH decreased in acidity with increasing soil depth at control plot and dumpsites areas. Total organic carbon was higher at dumpsites than control plot. Mean total organic carbon was highest at topsoil (0-15cm) and lowest at 30-45cm soil depth. Mean Pb, Fe, Cr, Zn, Ni and Cd were significantly higher at dumpsite than control plot at 0.05 significant levels. Heavy metals concentrations were lower than permissible limit of USEPA. Mean pH, total organic carbon, Pb, Fe, Cr, Zn, Ni and Cd decreased with increasing soil depths. Acidic level of leachates from dumpsites ranged from 4.63 to 5.13; and more acidic than USEPA permissible limit. Findings revealed mean NO3, SO4, PO4, Pb, Cr and Zn of leachates were highest at Igwuruta Dumpsite and higher than USEPA permissible limit. Study recommends proper monitoring and management of waste at open dump sites to forestall possible pollution of ground water.

Key words: Distribution, Heavy-Metals, Soils, Waste-Dump- Site, Port Harcourt.

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