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An Integrated Model for Input and Migration of Mercury in Chinese Coastal Sediments

机译：中国沿海沉积物中汞输入和迁移的综合模型

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摘要

Coastal sediments are a major sink of the global mercury (Hg) biogeochemical cycle, bridging terrestrial Hg migration to the open ocean. It is thus of substantial interest to quantify the Hg contributors to coastal sediments and the extents to which the Hg sequestered into coastal sediments affects the ocean. Here, we measured concentrations and isotope compositions of Hg in Chinese coastal sediments and found that estuary sediments had distinctly higher delta Hg-202 and lower Delta Hg-199 values than marine sediments. Hg isotope compositions of marine sediments followed a latitudinal trend where delta Hg-202 decreases and Delta Hg-199 increases from north to south. An integrated model was developed based on a Hg isotope mixing model and urban distance factor (UDF), which revealed a significant difference in Hg source contributions among the estuary and marine sediments and a gradual change of dominant Hg sources from terrestrial inputs (riverine and industrial wastewater discharges) to atmospheric deposition with a decrease in urban impact. A UDF value of 306 +/- 217 was established as the critical point where dominant Hg sources started to change from terrestrial inputs to atmospheric deposition. Our study helps explain the input and migration of Hg in Chinese marginal seas and provides critical insights for targeted environmental management.
机译：沿海沉积物是全球汞（Hg）生物地球化学循环的主要汇聚点，弥合了陆地Hg向露天海洋的迁移。因此，对量化汞对沿海沉积物的贡献以及隔离在沿海沉积物中的汞对海洋的影响程度具有重大意义。在这里，我们测量了中国沿海沉积物中Hg的浓度和同位素组成，发现河口沉积物的Hg-202三角洲值明显高于海洋沉积物，Hg-199三角洲值较低。海洋沉积物中的汞同位素组成呈纬向趋势，从北到南，δHg-202减小，δHg-199增大。基于汞同位素混合模型和城市距离因子（UDF），开发了一个综合模型，该模型揭示了河口和海洋沉积物中汞源贡献的显着差异，以及来自陆路输入（河流和工业）的主要汞源的逐渐变化废水排放到大气中，对城市的影响减小。 UDF值306 +/- 217被确定为主要汞源开始从地面输入变为大气沉积的临界点。我们的研究有助于解释汞在中国边缘海中的输入和迁移，并为有针对性的环境管理提供重要见解。

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  • 来源
    《Environmental Science & Technology》 |2019年第5期|2460-2471|共12页
  • 作者

    Meng Mei; Sun Ruo-yu; Liu Hong-wei; Yu Ben; Yin Yong-guang; Hu Li-gang; Shi Jian-bo; Jiang Gui-bin;

  • 作者单位

    Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China|Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China;

    Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China;

    Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China;

    Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China;

    Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China;

    Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China;

    Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China|Jianghan Univ, Inst Environm & Hlth, Wuhan 430056, Hubei, Peoples R China;

    Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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