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	Provedor de dados ArchiMer (2) Autor Sardessai, S (2) Wahidullah, S (1) Palavra-chave ARABIAN SEA (1) Acide humique (1) Arabian Sea (1) CP/MAS 13C RMN (1) CP/MAS C-13 NMR (1) Caractéristique structurale (1) ENVIRONMENTAL FACTORS (1) HUMIC ACIDS (1) Humic acids (1) Mer d'Arabie (1) ORGANIC CARBON (1) SURFICIAL SEDIMENTS (1) Structural characteristics (1) Surficial sediment (1) Sédiment superficial (1) Mais... Tipo do documento Text (2) Ano 1998 (1) 1994 (1) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Structural characteristics of marine sedimentary humic acids by CP/MAS C-13 NMR spectroscopy ArchiMer Sardessai, S; Wahidullah, S. Humic acids from sediments of different depositional environments have been studied by solid-state C-13 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 peptide 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... Tipo: Text Palavras-chave: Acide humique; Caractéristique structurale; CP/MAS 13C RMN; Mer d'Arabie; Sédiment superficial; Humic acids; Structural characteristics; CP/MAS C-13 NMR; Arabian Sea; Surficial sediment. Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43657/43217.pdf Organic-carbon and humic-acids in sediments of the arabian sea and factors governing their distribution ArchiMer Sardessai, S. Organic carbon and humic acids in the sediments of the Arabian Sea show distinct regional variations to the south and north of 15-degrees-N latitude. Significant variations are also observed from the shelf of the slope regions. Organic carbon and humic acids are enriched on the slope compared to the inner and outer shelf. While upwelling, primary productivity and redox conditions at the bottom are known to influence organic matter accumulation in sediments, bacterial population and sediment texture also contribute to the preservation of organic matter and humic acids. A positive correlation (r = 0.716) between total organic carbon and humic acid content in the sediments indicates fairly favourable conditions for the humification of organic matter. The C/N... Tipo: Text Palavras-chave: ORGANIC CARBON; HUMIC ACIDS; ARABIAN SEA; SURFICIAL SEDIMENTS; ENVIRONMENTAL FACTORS. Ano: 1994 URL: http://archimer.ifremer.fr/doc/00099/21026/18652.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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