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Chinese Journal of Oceanology and Limnology

, Volume 31, Issue 2, pp 454–463 | Cite as

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

  • Yaoling Zhang (张耀玲)
  • Jinzhou Du (杜金洲)Email author
  • Bo Peng (彭浡)
  • Fenfen Zhang (张芬芬)
  • Xin Zhao (赵欣)
  • Jing Zhang (张经)
Article

Abstract

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-8 and XAD-4 resins. Chemical 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.

Keyword

mangrove fulvic acid humic acid XAD-4 fraction FTIR NMR 

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Copyright information

© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Yaoling Zhang (张耀玲)
    • 1
  • Jinzhou Du (杜金洲)
    • 1
    Email author
  • Bo Peng (彭浡)
    • 2
  • Fenfen Zhang (张芬芬)
    • 1
  • Xin Zhao (赵欣)
    • 2
  • Jing Zhang (张经)
    • 1
  1. 1.State Key Laboratory of Estuarine and Coastal ResearchEast China Normal UniversityShanghaiChina
  2. 2.Department of PhysicsEast China Normal UniversityShanghaiChina

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