Scholarly work in the Department of Geology and Mineral Sciences

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Browsing Scholarly work in the Department of Geology and Mineral Sciences by Author "Bada Babatunde Saheed"

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    Heavy Metal Speciation and Health Risk Assessment of Soil and Jute Mallow (Corchorus olitorus) Collected From a Farm Settlement in Ikorodu, Lagos, Nigeria
    (Journal of Agricultural Chemistry and Environment, 2019) Adeyemi Moyosoluwa Odunayo; Akinloye Oluseyi Adeboye; Olujimi Olanrewaju Olusoji; Ogunbanjo Oriyomi Olalekan; Bada Babatunde Saheed; Makanjuola Olatunji Mojeed
    There is an increasing global concern for adverse effects of inorganic fertilizer and pesticides applied to agricultural soils. This study investigated metal speciation in soil and health risk assessment of Jute mallow (Corchorus olitoriuos) from a farm settlement in Ikorodu, Lagos State. Soil samples were collected according to the set standard procedure, sequentially extracted and analyzed for selected heavy metals using standard methods. Results showed that chromium (Cr) was associated with reducible fraction (Fe-Mn) for top soil, while cadmium (Cd), manganese (Mn), and copper (Cu); lead (Pb) and nickel (Ni); and Cr were predominantly bound to carbonate, reducible and residual mineral components respectively for sub-soil. The results of Contamination Factor (CF), Contamination Degree (CD), Pollution Load Index (PLI) and Geoaccumulation Index (Igeo) showed that the soil samples were not polluted for all the investigated metals. The Cd level in the soil (13.54 ± 1.21 mg∙kg−1) and vegetables (0.83 ± 0.05 mg∙kg−1) were above the USEPA critical permissible limit of 3.0 mg∙kg−1 and 0.1 - 1.2 mg∙kg−1 respectively. The daily intake of estimated selected heavy metals from the vegetable ranged from 8.8 × 10−03 to 1.4 × 10−02 for adult and 3.8 × 10−03 to 1.1 × 10−02 for children while the Hazard Quotient (HQ) for adults ranged from 5.4 × 10−05 to 1.1 × 10−01 and that of children ranged from 8.3 × 10−03 to 1.4 × 10−02. The cancer risk (CR) values of heavy metals in the soil ranged from 1.02 × 10−11 to 9.90 × 10−10 and 4.45 × 10−09 to 8.61 × 10−09 for children and adults respectively. The level of cancer risk was below the threshold values (10−4 - 10−6) which USEPA considered as unacceptable risk. The consumption of Jute mallow grown at Ikorodu Farm Settlement is assessed to be free of risk. Hence heavy metal analysis should be included in routine soil analysis before planting.