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 Structural description of humic substances from subtropical coastal environments using elemental analysis, FT-IR and C-13-solid state NMR data
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/6792

title: Structural description of humic substances from subtropical coastal environments using elemental analysis, FT-IR and C-13-solid state NMR data
authors: SIERRA, Marta M D
GIOVANELA, Marcelo
PARLANTI, E
Esteves, Valdemar I.
Duarte, Armando C.
Fransozo, A.
Soriano-Serra, E. J.
keywords: Humic acids
Fulvic acids
Infrared spectroscopy
Lake
Coastal marine
Estuary
issue date: 2005
publisher: Coastal Education and Research Foundation
abstract: Elemental composition and spectroscopic properties (FT-IR and CP/MAS '3C-NMR) of sedimentary humic substances (HS) from aquatic subtropical environments (a lake, an estuary and two marine sites) are investigated. Humic acids (HA) are relatively richer in nitrogen and in aliphatic chains than fulvic acids (FA) from the same sediments. Conversely, FA are richer in carboxylic groups and in ring polysaccharides than HA. Nitrogen is mostly present as amide groups and for lake and marine HS the FT-IR peaks around 1640 cm-1 and 1540 cm-1 identify polypeptides. Estuarine HS exhibit mixed continental-marine influences, these being highly influenced by site location. Overall, the data suggest that aquatic and mixed HS are more aliphatic than has been proposed in current models and also that amide linkages form an important part of their structural configuration
URI: http://hdl.handle.net/10773/6792
ISSN: 0749-0208
publisher version/DOI: http://www.jcronline.org/
source: Journal of Coastal Research
appears in collectionsDQ - Artigos
PT Mar - Artigos

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