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

IR@NIO: CSIR-National Institute Of Oceanography, Goa


Field	Value

Creator	Chakraborty, P. Babu, P.V.R. Sarma, V.V.

Date	2011-07-29T10:07:40Z 2011-07-29T10:07:40Z 2011

Identifier	Journal of Geochemical Exploration, vol.110(2); 2011; 225-231 no http://drs.nio.org/drs/handle/2264/3896

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

Language	en

Publisher	Elsevier

Relation	J_Geochem_Explor_110_225.jpg

Rights	An edited version of this paper was published by Elsevier. Copyright [2011] Elsevier

Subject	Lanthanum speciation Sequential extraction method Kinetic extraction method Lanthanum–organic complexes Rare earth speciation sediments

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

Type	Journal Article