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Structural characteristics of marine sedimentary humic acids by CP/MAS sup(13)C NMR spectroscopy

DRS at CSIR-National Institute of Oceanography

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Title Structural characteristics of marine sedimentary humic acids by CP/MAS sup(13)C NMR spectroscopy
 
Creator Sardessai, S.
Wahidullah, S.
 
Subject humic acids
sedimentary environments
sediments
chemical analysis
organic acids
spectroscopic techniques
 
Description Humic acids from sediments of different depositional environments have been studied by solid-state sup(13)C NMR and the results compared with the traditional wet chemical analysis. Results obtained are well in agreement with the previous literature reports that the carboxyl content measured by NMR correlated better with the total acidity, as well as with the carboxyl content obtained by wet chemical analysis after correction for amino acid carboxyl is made (following hydrolysis of petide bonds). There is a large discrepancy between the NMR and wet chemical measurements of phenolics. NMR spectra was also indicative of branched paraffinic structures in the humic acids from the Arabian Sea; the humic acids of sediments from estuarine and coastal areas of the Bay of Bengal being dominated by carbohydrates and aromatic structures and to a lesser extent by paraffinic structures. These differences are attributed to their different biogeochemical origin
 
Date 2009-01-11T12:01:10Z
2009-01-11T12:01:10Z
1998
 
Type Journal Article
 
Identifier Oceanologica Acta, Vol.21; 543-550p.
http://drs.nio.org/drs/handle/2264/1927
 
Language en
 
Rights Copyright [1998]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Ifremer/ CNRS/ IRD/ Editions scientifiques et medicales Elsevier SAS. Tous droits reserves