Chemical and spectroscopic characterization of dissolved humic substances in a mangrove-fringed estuary in the eastern coast of Hainan Island, China

Mangrove-derived dissolved organic matter （DOM） has an important effect on estuarine and coastal area on a large scale. In order to improve the understanding of origin, composition, and fate of DOM in mangrove-fringed estuarine and coastal areas, dissolved humic substances （DHS） were isolated from o...

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Published in:Chinese journal of oceanology and limnology 2013-03, Vol.31 (2), p.454-463
Main Author: 张耀玲 杜金洲 彭浡 张芬芬 赵欣 张经
Format: Article
Language:English
Subjects:
Aliphatic compounds
Aromatic compounds
Biogeochemistry
Brackish
Brackishwater environment
Carbohydrates
Carbon-nitrogen ratio
Chemical analysis
Coastal zone
Dissolved organic matter
Earth and Environmental Science
Earth Sciences
Estuaries
Estuarine dynamics
Forests
Fulvic acids
Humic acids
Humic substances
Mangroves
Marine
NMR
Nuclear magnetic resonance
Oceanography
Oxidation
Photooxidation
Pore water
Resins
Seawater
Water analysis
Water sampling
东部沿海
中国海南岛
光谱特性
河口
溶解有机物
环绕
红树林
腐殖物质
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description Mangrove-derived dissolved organic matter （DOM） has an important effect on estuarine and coastal area on a large scale. In order to improve the understanding of origin, composition, and fate of DOM in mangrove-fringed estuarine and coastal areas, dissolved humic substances （DHS） were isolated from one mangrove pore-water sample and one near-shore seawater sample downstream the mangrove pore-water site in the eastern coast of Hainan Island, South China. Fulvic acids, humic acids and XAD-4 fractions were obtained from the two water samples by using a two-column array of XAD-g and XAD-4 resins. Chemica~ and spectroscopic methods were used to analyze the features of these DHS. Compared to the mangrove pore-water DHS, the near-shore seawater DHS were found rich in 13C with lower C/N ratios and more aliphatic compounds and carbohydrates, but less aromatic structures and carboxyl groups. As for the three fractions of the two DHS, XAD-4 fractions contain more aliphatics, carbohydrates, carboxyl groups, and enrich in 13C with respect to both fulvic and humic acids. Photo-oxidation transformation and contribution from marine-derived DOM were considered as the main reasons resulted in the difference in compositional features for these DHS in this study.
doi_str_mv 10.1007/s00343-013-2138-7
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identifier ISSN: 0254-4059
ispartof Chinese journal of oceanology and limnology, 2013-03, Vol.31 (2), p.454-463
issn 0254-4059
2096-5508
1993-5005
2523-3521
language eng
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source Springer Link
subjects Aliphatic compounds
Aromatic compounds
Biogeochemistry
Brackish
Brackishwater environment
Carbohydrates
Carbon-nitrogen ratio
Chemical analysis
Coastal zone
Dissolved organic matter
Earth and Environmental Science
Earth Sciences
Estuaries
Estuarine dynamics
Forests
Fulvic acids
Humic acids
Humic substances
Mangroves
Marine
NMR
Nuclear magnetic resonance
Oceanography
Oxidation
Photooxidation
Pore water
Resins
Seawater
Water analysis
Water sampling
东部沿海
中国海南岛
光谱特性
河口
溶解有机物
环绕
红树林
腐殖物质
title Chemical and spectroscopic characterization of dissolved humic substances in a mangrove-fringed estuary in the eastern coast of Hainan Island, China
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