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| Evaluation of Heavy Metals in Soils from Different Dumpsites |
Adegboye, Musa Alamu, Adekanmi, Abideen Adeyinka, Lawal , Ibraheem Kehinde, Owolabi, Oluwafemi Akinkunmi, Omole, Folasade Oyindamola
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Abstract:
Open dumps are a source of various environmental and health hazards. The decomposition of organic materials produces methane, which may cause explosions and produce leachates, which pollute surface and ground water. The main objective of the study is to assess the heavy metals present in dumpsites in Ile Ife, Osun State. Soil samples were collected from three different dumpsites using sterile polythene bag. 2.0g of the sieved soil samples was digested for 3hours at 85oC in 12ml of aqua regia (3:1 HCl-HNO3v/v) using a hot plate in a fume cupboard until white fumes are observed. Digested soil waste samples were analyzed for the heavy materials; Cd, Pb, Co, Cr, Ni; using Atomic Absorption Spectrophotometer (AAS: iCE 3000 series). The results of the findings reveals that soil sample from SAMPLE A had 0.09±0.006, 0.28±0.06, 1.98±0.04, 0.19±0.008 and 0.02±0.006 of cadmium, lead, cobalt, chromium and nickel. SAMPLE B soil sample had cadmium, lead, cobalt, and chromium and nickel concentrations of 0.02±0.006, 1.56±0.24, 1.81±0.01, 0.15±0.01 and 0.01±0.006 respectively. Soil sample collected from SAMPLE C had 0.09±0.006, 0.68±0.08, 1.10±0.07, 0.22±0.08 and 0.02±0.006. The study showed that all the dumpsites soil samples collected contained Cadmium, Lead, Cobalt, Chromium and Nickel but are within permissible standards by WHO and SON.
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