Volume 10 Issue 6
Nov.  2020
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Article Navigation >  Journal of Environmental Engineering Technology  > 2020  >  10(6): 936-943
GUO Yunyan, ZHOU Guangxin, WANG Yawen, WANG Shuhang, ZHENG Shuofang, JIANG Xia, GAO Jianwen. Occurrence characteristics, sources and bioavailability of organic matter in surface sediments of Nanhu Lake water system[J]. Journal of Environmental Engineering Technology, 2020, 10(6): 936-943. doi: 10.12153/j.issn.1674-991X.20200071
Citation: GUO Yunyan, ZHOU Guangxin, WANG Yawen, WANG Shuhang, ZHENG Shuofang, JIANG Xia, GAO Jianwen. Occurrence characteristics, sources and bioavailability of organic matter in surface sediments of Nanhu Lake water system[J]. Journal of Environmental Engineering Technology, 2020, 10(6): 936-943. doi: 10.12153/j.issn.1674-991X.20200071
shu

Occurrence characteristics, sources and bioavailability of organic matter in surface sediments of Nanhu Lake water system

doi: 10.12153/j.issn.1674-991X.20200071
  • 1.

    State Environmental Protection Key Laboratory for Lake Pollution Control, Chinese Research Academy of Environmental Sciences

  • 2.

    National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences

  • 3.

    School of Energy and Environmental Engineering, Hebei University of Technology

  • 4.

    CCCC Shanghai Waterway Engineering Design and Consulting Co., Ltd.

More Information
  • Corresponding author: WANG Shuhang E-mail: shuhang125126@163.com
  • Received Date: 2020-03-30
  • Publish Date: 2020-11-20
    Abstract
  • In order to ascertain the occurrence characteristics and sources of organic matter in the sediments of Nanhu Lake water system in Jiaxing, the continuous extraction and three-dimensional fluorescence spectroscopy were used to systematically analyze the content, composition, source and stability of the organic matter in surface sediments of the lake. The results showed that the total organic matter content in surface sediments ranged from 5.96 to 40.04 g/kg, with an average value of 15.69 g/kg. Average content of water-soluble organic matter (WSOM), fulvic acid (FA), Humin (HM) and humic acid (HA) were 0.62, 5.22, 5.00, 4.85 g/kg, respectively. Four fluorescent components were identified in the surface sediment WSOM, including two humus-like components (C2 and C3) and two protein-like components (C1 and C4). Among the four components, C1 was dominated by tryptophan-like fluorescence peaks, C2 by fulvic acid fluorescence peaks , C3 by humic acid fluorescence, and C4 by tyrosine fluorescence. The average value of C/N ratio in surface sediments of Nanhu Lake water system was 7.71, and the fluorescence index (FI) and humification index (HIX) were 1.54-1.78 and 1.62-7.76, respectively, indicating that the source of organic matter in the surface sediments of Nanhu Lake water system was endogenous, which accounted for a large proportion, and mainly from the processes of metabolism of its own microorganisms, and the degree of humification was weak. The correlation analysis showed that the fluorescent components of WSOM in surface sediments were significantly positively correlated with both ammonia nitrogen (AN) and water-soluble organic nitrogen (SON) (P<0.01), which showed high bioavailability.

     

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