Comparison study of sedimentary humic substances isolated from contrasting coastal marine environments by chemical and spectroscopic analysis

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• 作者：Yaoling Zhang ; Jinzhou Du ; Xiuping Ding ; Fenfen Zhang
• 关键词：Fulvic acids ; Humic acids ; CP/MAS 13C NMR ; Py ; GC/MS ; Potentiometric titration ; Sediments ; Estuary ; Continental shelf ; Continental slope
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：75
• 期：5
• 全文大小：1,041 KB
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• 作者单位：Yaoling Zhang (1) (2)
  Jinzhou Du (2)
  Xiuping Ding (1)
  Fenfen Zhang (2)
  
  1. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, People’s Republic of China
  2. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, People’s Republic of China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

To gain a better understanding of the chemical structural composition and reactivity of sedimentary organic matter in coastal environments, the properties of sedimentary humic substances (HSs) isolated from contrasting coastal marine environments (i.e., salt marsh estuary, continental shelf, and continental slope) in China were investigated and compared. The complementary analytical approaches employed included elemental analysis, cross polarization magic angle spinning (CP/MAS)-13C nuclear magnetic resonance, pyrolysis-gas chromatography–mass spectrometry, and potentiometric titrations. The results indicate that HSs isolated from the salt marsh site in the Changjiang Estuary, which is strongly influenced by terrestrial river inputs, had the highest content of lignin-derived components, such as phenols and alkyl phenols, and acidic functional groups; HSs from the continental slope site in the South China Sea, which mainly originated from the inputs of marine algae and planktons, contained the highest level of aliphatic compounds, carbohydrates, and nitrogen-containing compounds; however, HSs from the continental shelf site in the East China Sea presented a mixture of both land and marine properties due to the influence of the two sources. Humic acids were found to contain comparatively more highly branched, long-chain aliphatic components but fewer oxygen-containing functional groups, such as carboxyl groups, and fewer sulfur-containing compounds than their fulvic acid counterparts. The total concentrations of proton binding sites and the structural characteristics of the studied HSs may provide insights into the migration and fate of HS-bound contaminants, such as heavy metals and organic pollutants, in coastal marine systems.