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IJMS Vol.31(2) [June 2002] >

Title: Quantitative study of Co(II) complexation by synchronous fluorescence spectroscopy with Sundarban mangrove habitat humic substances
Authors: Ghatak, H.
Mukhopadhyay, S. K.
Biswas, H.
Sen, S.
Jana, T. K.
Keywords: Humic substances
spectral characteristics
Co (II) complexation
Issue Date: Jun-2002
Publisher: CSIR
Abstract: Attempt has been made to isolate and characterize humic substances and their relative role for complexation of Co (II) in the mangrove sediment. Conditional stability constant (Kc) for Co (II) complexes with humic and fulvic acids were determined by studying quenching of fluorescence intensity of humic substances with Co (II) using synchronous fluorescence spectroscopy. Fulvic acid forms more stable complex than humic acid with Kc of the order of 4.7 x 1011 and 1.02 x 1011, respectively at pH 7, ionic strength of 0.1 and temperature of 250C. Rigid frame work of fulvic acid having more electron donor groups as –OH, -NH2 and less incorporation of –COOH than humic acid could be the reason for its formation of more stable complex with Co (II) than humic acid.
Page(s): 136-140
ISSN: 0379-5136
Source:IJMS Vol.31(2) [June 2002]

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