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Partitioning of metals in different binding phases of tropical estuarine sediments: importance of metal chemistry

DRS at CSIR-National Institute of Oceanography

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Title Partitioning of metals in different binding phases of tropical estuarine sediments: importance of metal chemistry
 
Creator Chakraborty, P.
Chakraborty, S.
Vudamala, K.
Sarkar, Arindam
Nath, B.N.
 
Subject GEOLOGY AND GEOPHYSICS
GEOLOGY AND GEOPHYSICS
CHEMISTRY AND BIOGEOCHEMISTRY
CHEMISTRY AND BIOGEOCHEMISTRY
 
Description Distribution of metals in different binding phases of estuarine sediments provides chemically significant description of metal–sediment interactions. This study describes the influences of ligand field stabilization energy (LFSE), Jahn–Teller effect, and water exchange rate (k-w) on metal distribution in different binding phases of estuarine sediments. It was found that Cu had highest affinity for organic binding phases in the studied sediments followed by Ni and Pb. However, Pb showed strong association with Fe/Mn oxide phases followed by Ni and Cu. Faster k-w of Cu (II) (1×109 s-1) increased the rate of complex formation of Cu2+ ion with ligand in the organic phases. The Cu–ligand (from organic phase) complexes gained extra stability by the Jahn–Teller effect. The combined effects of these two phenomena and high ionic potential increased the association of Cu with the organic phases of the sediments than Ni and Pb. The smaller ionic radii of Ni2+ (0.72 Å) than Pb2+ (1.20 Å) increase the stability of Ni–ligand complexes in the organic phase of the sediments. High LFSE of Ni(II) (compared with Pb2+ ions) also make Ni-organic complexes increasingly stable than Pb. High k-w (7×109 s-1) of Pb did not help it to associate with organic phases in the sediments. The high concentration of Pb in the Fe/Mn oxyhydroxide binding phase was probably due to co-precipitation of Pb2+ and Fe3+. High surface area or site availability for Pb2+ ion on Fe oxyhydroxide phase was probably responsible for the high concentration of Pb in Fe/Mn oxyhydroxide phase. Increasing concentrations of Cu in organic phases with the increasing Cu loading suggest that enough binding sites were available for Cu in the organic binding phases of the sediments. This study also describes the influence of nature of sedimentary organic carbon (terrestrial and marine derived OC) in controlling these metal distribution and speciation in marine sediment
 
Date 2016-03-08T11:24:12Z
2016-03-08T11:24:12Z
2016
 
Type Journal Article
 
Identifier Environmental Science and Pollution Research, vol.23(4); 2016; 3450-3462
no
http://drs.nio.org/drs/handle/2264/4915
 
Language en
 
Relation Environ_Sci_Pollut_Res_23_3450.jpg
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2016] Springer
 
Publisher Springer