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Chemical Partitioning of Iron, Cadmium, Nickel and Chromium in Contaminated Soils of South-Eastern Nigeria

Author Affiliations

  • 1Department of Chemistry, Delta State University, Abraka, NIGERIA

Res.J.chem.sci., Volume 2, Issue (5), Pages 1-9, May,18 (2012)

Abstract

Selected heavy metals Fe, Cd, Ni, and Cr were studied in contaminated soil samples collected from South − Eastern Nigeria, for their geochemical differentiation into different chemical fractions, using Ma and Rao six steps sequential chemical extraction procedure in order to assess the potential mobility and bioavailability of the heavy metals in the soil profiles. It is evident from the study that the residual fraction was the most important phase for the four heavy metals under study with the following average percentage values 74.43 for Fe, 37.69 for Cd, 70.11for Ni and 62.47 for Cr. The carbonate fraction contained an appreciable portion of Fe, Cd and Ni with the average percentage values of 16.29, 14.86 and 10.47 respectively, while organic fraction was of next importance for Cr with an average percentage value of 27.14. Fe − Mn oxide fraction also contained 15.86% of Cd. Relatively low amount of the metals were associated with water soluble and exchangeable fractions. The mobility factors for the metals in all the sites ranged from 8.55 to 40.04 for Fe, 8.66 to 56.58 for Cd, 12.74 to 30.19 for Ni and 0.82 to 7.22 for Cr. The generally low values of mobility factors coupled with significantly high level of association of the metals with the residual fraction, indicate that the metals do not pose any environmental risk or hazard.

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