Effects of bottom water dissolved oxygen variability on copper and lead fractionation in the sediments across the oxygen minimum zone, western continental margin of India

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dc.contributor.author Chakraborty, P.
dc.contributor.author Chakraborty, S.
dc.contributor.author Jayachandran, S.
dc.contributor.author Madan, R.
dc.contributor.author Sarkar, Arindam
dc.contributor.author Linsy, P.
dc.contributor.author Nath, B.N.
dc.date.accessioned 2016-10-13T12:49:14Z
dc.date.available 2016-10-13T12:49:14Z
dc.date.issued 2016
dc.identifier.citation Science of the Total Environment, vol.566-567; 2016; 1052-1061
dc.identifier.other no
dc.identifier.uri http://drs.nio.org/drs/handle/2264/5035
dc.description.abstract This study describes the effect of varying bottom-water oxygen concentration on geochemical fractionation (operational speciation) of Cu and Pb in the underneath sediments across the oxygen minimum zone (Arabian Sea) in the west coast of India. Both, Cu and Pb were redistributed among the different binding phases of the sediments with changing dissolved oxygen level (from oxic to hypoxic and close to suboxic) in the bottom water. The average lability of Cu-sediment complexes gradually decreased (i.e., stability increased) with the decreasing dissolved oxygen concentrations of the bottom water. Decreasing bottom-water oxygen concentration increased Cu association with sedimentary organic matter. However, Pb association with Fe/Mn-oxyhydroxide phases in the sediments gradually decreased with the decreasing dissolved oxygen concentration of the overlying bottom water (due to dissolution of Fe/Mn oxyhydroxide phase). The lability of Pb-sediment complexes increased with the decreasing bottom-water oxygen concentration. This study suggests that bottom-water oxygen concentration is one of the key factors governing stability and lability of Cu and Pb complexes in the underneath sediment. Sedimentary organic matter and Fe/Mn oxyhydroxide binding phases were the major hosting phases for Cu and Pb respectively in the study area. Increasing lability of Pb-complexes in bottom sediments may lead to positive benthic fluxes of Pb at low oxygen environment
dc.language.iso en
dc.publisher Elsevier
dc.relation.requires Sci_Total_Environ_566-567_1052.jpg
dc.rights An edited version of this paper was published by Elsevier. Copyright [2016] Elsevier
dc.subject Chemistry and biogeochemistry
dc.subject Chemistry and biogeochemistry
dc.subject Geology and geophysics
dc.subject Geology and geophysics
dc.title Effects of bottom water dissolved oxygen variability on copper and lead fractionation in the sediments across the oxygen minimum zone, western continental margin of India
dc.type Journal Article


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