

FOLLOWUS
1.Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
2.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
DU Jinzhou, jzdu@sklec.ecnu.edu.cn
Received:02 August 2016,
Accepted:22 September 2016,
Online First:17 November 2016,
Published:2018-03
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Yaoling ZHANG, Keli YANG, Jinzhou DU, et al. Chemical characterization of fractions of dissolved humic substances from a marginal sea-a case from the Southern Yellow Sea[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(2): 238-248.
Yaoling ZHANG, Keli YANG, Jinzhou DU, et al. Chemical characterization of fractions of dissolved humic substances from a marginal sea-a case from the Southern Yellow Sea[J]. Chinese Journal of Oceanology and Limnology, 2018, 36(2): 238-248. DOI: 10.1007/s00343-017-6202-6.
Marine dissolved organic matter (DOM) is one of the largest dynamic pools of organic carbon in the global carbon cycle
yet DOM is still chemically poorly characterized. To better understand the origin
composition
and cycling of DOM in the China marginal sea
dissolved humic substances (DHS) were isolated from seawaters in two locations in the Southern Yellow Sea. The DHS were subdivided into fulvic acids (FAs)
humic acids (HAs) and the XAD-4 fractions. Complementary analytical approaches were used to characterize the isolated DHS samples including stable carbon isotopic composition
Fourier transform infrared spectroscopy (FTIR)
13
C cross polarization magic angle spinning (CP/MAS) nuclear magnetic resonance (NMR)
and pyrolysis gas chromatography-mass spectrometry (Py-GC/MS). The results demonstrated that both DHS samples encountered the influences from marine source
indicating that algal and microbial-derived materials are the predominant precursors for the studied samples. The three fractions of DHS showed different properties. FAs presented more aromatic features
whereas HAs contained more aliphatic lipids and proteinaceous materials. The XAD-4 fractions were enriched in
13
C and contained more carbohydrates but less aromatic compounds. The lower molecular weight and higher heteroatom content and number of carboxyl groups for the XAD-4 fractions may give them considerable geochemical significance for aspects of trace metal species
bioavailability of pollutants
mineral weathering and water acidification in marine environments.
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