Orobator, P., Daniel, A. (2025). Assessment of potentially toxic elements contamination in soils across different land uses in a rural-urban fringe area of Edo State. Aswan University Journal of Environmental Studies, 6(2), 108-125. doi: 10.21608/aujes.2025.354729.1321
Paul Orobosa Orobator; Abiemwense Daniel. "Assessment of potentially toxic elements contamination in soils across different land uses in a rural-urban fringe area of Edo State". Aswan University Journal of Environmental Studies, 6, 2, 2025, 108-125. doi: 10.21608/aujes.2025.354729.1321
Orobator, P., Daniel, A. (2025). 'Assessment of potentially toxic elements contamination in soils across different land uses in a rural-urban fringe area of Edo State', Aswan University Journal of Environmental Studies, 6(2), pp. 108-125. doi: 10.21608/aujes.2025.354729.1321
Orobator, P., Daniel, A. Assessment of potentially toxic elements contamination in soils across different land uses in a rural-urban fringe area of Edo State. Aswan University Journal of Environmental Studies, 2025; 6(2): 108-125. doi: 10.21608/aujes.2025.354729.1321
Assessment of potentially toxic elements contamination in soils across different land uses in a rural-urban fringe area of Edo State
1Department of Geography and Regional Planning, Faculty of Social Sciences, University of Benin
2No 10 Adolor Street off Second East Circular Road
Abstract
This work focused on the assessment of potentially toxic elements contamination in soils across different land uses in a rural-urban fringe area of Edo State. Soil samples were collected from mechanic workshop, secondary forest, block molding site, oil palm production site, fire wood processing site, cassava farm, backyard farm, cooking gas plant site and oil palm plantation. The soil samples were analyzed for Lead (Pb), Chromium (Cr), Cobalt (Co), Arsenic (As), Cadmium (Cd), Vanadium (V) and Nickel (Ni) using USEPA method 3050B. The findings indicated that Co, As, and Ni concentrations were higher in backyard farm, whereas Cr and Cd concentrations were higher in the oil palm plantation. The firewood processing site demonstrated higher Pb concentrations, and V concentrations were higher in both the backyard farm and secondary forest. Very slight contamination of Pb, Co, Cr, As, V, and Ni was detected across the land uses. However, Cd slightly contaminated mechanic workshop, secondary forest, firewood processing site, cassava farm and cooking gas plant, severely contaminated backyard farm, and slightly polluted oil palm plantation. The study concluded that the soils were contaminated with Co, As, V, Ni, Cr, Cd, and Pb to varying levels across the land uses, with backyard farm and oil palm plantation identified as Cd contamination hotspots in the rural-urban fringe area. The use of phosphorus compounds, lime, or clays is recommended as mitigation strategies against Cd contamination in backyard farm and oil palm plantation soils.
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