Metal partitioning in sediment pore water from the Ondo coastal region,Nigeria |
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Authors: | IA Ololade L Lajide OO Ololade O Adeyemi |
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Institution: | 1. Department of Chemistry and Industrial Chemistry , Adekunle Ajasin University , P.M.B. 001, Akungba-Akoko, Ondo State, Nigeria;2. State Key Laboratory for Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100085, China olisa200@yahoo.com;4. Department of Chemistry , Federal University of Technology , P.M.B. 734, Akure, Nigeria;5. Department of Geography, Environmental Management and Energy Studies, Faculty of Science , University of Johannesburg , Auckland Park Campus, Johannesburg, South Africa;6. Department of Environmental Sciences , Federal University of Petroleum Resources , Effurun, Delta State, Nigeria |
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Abstract: | Distribution and equilibrium partitioning of metals (Cd, Cu, Cr, Fe, Ni, Pb, Mn, and Zn) between pore water and surface sediments at the Ilaje coast of Ondo State, Nigeria, were studied. The Ilaje River can be one of the interesting research locations because of its economic nature and history of oil pollution. Seasonal variations were observed to investigate possible variations in the availability of metals for organisms throughout the year. The concentrations in both sediments and pore water during the dry and wet seasons were as follows: Cu?>?Fe???Mn?>?Pb?>?Ni?>?Cr?>?Cd?>?Zn. The pore water–sediment partition coefficient (K p) showed that Zn and Cd were highly mobile while Fe and Cu have restricted mobility. Dissolved organic carbon (DOC) in pore water had a strong influence on mobility and bioavailability of all the metals (p?0.05) except Cr whose concentration was pH and DOC-dependent. Based on the normalized organic carbon partitioning coefficient (K oc), increased levels of Fe and Cu were linked to lithological origin. Concentrations of Pb and Ni were associated with petroleum-related sources. The significance of the field-based techniques for ecotoxicological purposes is discussed. |
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Keywords: | sediments pore water heavy metals equilibrium partitioning bioavailability |
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