Sequential extraction for the speciation of trace heavy metals in Hoogly river sediments, India
Journal Title: International Journal of Experimental Research and Review - Year 2016, Vol 6, Issue 5
Abstract
The spatial variation of metal concentrations in the sediments is associated with the level of pollution along river stretches. Thus, the chemical speciation of seven trace heavy metals (Co, Cd, Cr, Cu, Ni, Pb and Zn) in Hooghly River sediments from four sampling locations was determined using the modified BCR sequential extraction procedure. The studied sediments were observed to be highly heterogeneous in their textural characteristics, showing wide differences in grain sizes. On average 93% Pb, 70% Co, 62% Cd and 55% of total Cu were estimated to be partitioned with the first three labile sequential extraction phases. As these fractions are readily bioavailable, they may influence negative biological effects in their concerned aquatic ecosystem. The presence of Ni, Cr and Zn in high proportion within the residual section (58−82%) and their simultaneous low levels in the exchangeable fraction indicated that the analyzed sediments were relatively unpolluted with Ni, Cr and Zn. The presence of exchangeable Cd (27%) at Diamond Harbor sampling point is a serious threat to the Sundarban National Park, which is also notified as a (Royal Bengal) Tiger Reserve, a Biosphere Reserve and an UNESCO World Heritage Site.
Authors and Affiliations
Piyal Bhattacharya; Alok Chandra Samal; Tanushree Bhattacharya
Keywords
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