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A multi-method approach for the study of lanthanum speciation in coastal and estuarine sediments

DRS at CSIR-National Institute of Oceanography

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Title A multi-method approach for the study of lanthanum speciation in coastal and estuarine sediments
 
Creator Chakraborty, P.
Babu, P.V.R.
Sarma, V.V.
 
Subject Lanthanum speciation
Sequential extraction method
Kinetic extraction method
Lanthanum–organic complexes
Rare earth speciation
sediments
 
Description Two independent analytical methods (sequential extraction and kinetic extraction methods) were applied in order to understand the distribution and speciation of La in the coastal and estuarine sediments from the central east coast of India. Sequential extraction study revealed that La was primarily present as inert complexes (~ 50–60% of the total La) in all the sediments. Amounts of ~ 20–30% of the total La in all the sediments were found to associate with the total organic carbon (TOC) in the sediments. The dissociation rate constants of La–sediment complexes obtained from kinetic extraction studies revealed that the concentration of thermodynamically weak complexes of La gradually increased with the increasing La/TOC ratio in the sediments. The results of this investigation demonstrate that combination of two analytical methods having complementary analytical capabilities can provide a better physicochemical picture of La speciation than either one of the method can do alone. Combination of the data obtained from sequential extraction and kinetic extraction methods suggest that TOC is one of the key factors in controlling speciation and distribution of La in the sediments
 
Date 2011-07-29T10:07:40Z
2011-07-29T10:07:40Z
2011
 
Type Journal Article
 
Identifier Journal of Geochemical Exploration, vol.110(2); 2011; 225-231
no
http://drs.nio.org/drs/handle/2264/3896
 
Language en
 
Relation J_Geochem_Explor_110_225.jpg
 
Rights An edited version of this paper was published by Elsevier. Copyright [2011] Elsevier
 
Publisher Elsevier