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| Assessment of Heavy Metals in Fish Ponds |
Lawal, Ibraheem Kehinde, Adegboye, Musa Alamu, Adekanmi, Abideen Adeyinka, Cole, Alice Temitope, Olajide Oyinloluwa Fisayomi, Omole, Folasade Oyindamola
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Abstract:
Aquatic habitats are becoming progressively polluted due to indiscriminate discharge of pollutants generated from various industries, transportation and fossil fuel burning. The main objective of the study is to assess the heavy metals present in three ponds in Oke Osun, Osogbo. A total of 4 litres each of water samples from different points at 20 cm depth of the pond were collected using 250 mL bottles which were pre-washed with 10 % nitric acid and distilled water. Acid preserved water sample (100 mL) was taken in a beaker and 10 mL of nitric acid was added. It was then brought to a slow boil and evaporated on a hot plate to the lowest volume possible of 15mL before precipitation occurred. Atomic Absorption Spectrophotometer was used for the metal determinations which involved the use of Hollow Cathode lamp (HCL) for each of the respective elements. The mean concentrations (mg/L) of the heavy metals determined were: Cd; 0.01±0.006, Pb; 0.15±0.04, Co; 1.93±0.05, Cr; 0.31±0.01 and Ni; 0.03±0.006 mg/L in the order of Co > Cr > Pb > Cd for Pond A. Pond B had Cd; 0.03±0.03, Pb; 0.35±0.08, Co; 0.37±0.03, Cr; 0.42±0.006 and Ni; 0.06±0.0006 mg/L while Cd; 0.01±0.006, Pb; 0.22±0.02, Co; 1.11±0.09, Cr; 0.23±0.02 and Ni; 0.02±0.006 mg/L for pond C The study showed that all the water samples collected from pond contained Cd, Pb, Co, Cr and Ni, with concentration above permissible standards by WHO and SON.
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