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|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|
Esteves, Valdemar I.
Duarte, Armando C.
Soriano-Serra, E. J.
|keywords: ||Humic acids|
|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|
|publisher version/DOI: ||http://www.jcronline.org/|
|source: ||Journal of Coastal Research|
|appears in collections||DQ - Artigos|
PT Mar - Artigos
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