Chemical fractionation of heavy metals in soils around oil installations, Assam

Authors: Kotoky, P.; Bora, B. J.; Baruah, N. K.; Baruah, J.; Baruah, P.; Borah, G. C.

Source: Chemical Speciation and Bioavailability, Volume 15, Number 4, November 2003 , pp. 115-126(12)

Publisher: Science Reviews 2000 Ltd

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Abstract:

The chemical fractionation of lead, cobalt, chromium, nickel, zinc, cadmium and copper in soils around Lakwa oil field, Assam, India was studied using a sequential extraction method. It is evident from the study that the residual fraction is the most important phase for the seven heavy metals under study. Among non-residual fractions metals are mostly associated with the Fe-Mn oxides fraction. The association of heavy metals with organic matter was observed in the following order: copper>cadmium>zinc>lead. The concentration of Pb in the carbonate fraction for both the seasons is higher compared with other metals, which may pose environmental problems due to its highly toxic nature. The comparatively low concentration of metals in the exchangeable fraction indicates low bioavailability. Correlations between physicochemical parameters and metal fractions of soil do not show consistent behaviour. The local mean values of metals when compared with the accepted values of normal abundance and geochemical background, indicates two to four fold increases in this area. However, the values are within the range of normal abundance. As well as from natural soil geochemical behaviour, anthropogenic influence might have a close bearing on the association of metals with the soil system in the studied area.

Keywords: Assam; fractionation; Group Gathering Station; heavy metals; oil installation

Document Type: Research article

DOI: http://dx.doi.org/10.3184/095422903782775181

Affiliations: 1: Geoscience Division, Regional Research Laboratory (CSIR) Jorhat - 785 006, Assam, India

Publication date: 2003-11-10

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Chemical Speciation & Bioavailability covers a rapidly expanding area in environmental science.
Research on the interactions between the chemical forms and behaviour of toxic compounds and their subsequent biological uptake, metabolism and ecological fate involves many scientific fields. These studies are often published in discipline-specific journals, leading to inadequate review and information scatter. This situation hinders both the development of an international community of experienced colleagues and the open flow of information and discussion. Additionally, the importance of speciation and bioavailability research to the development of pollution law and control technologies is being increasingly appreciated by environmental regulatory agencies throughout the world.
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Chemical fractionation of heavy metals in soils around oil installations, Assam

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