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首页> 外文期刊>Environmental Science & Technology >Sediment-Porewater Partitioning, Total Sulfur, and Methylmercury Production in Estuaries
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Sediment-Porewater Partitioning, Total Sulfur, and Methylmercury Production in Estuaries

机译:河口沉积物-地下水分配,总硫和甲基汞的产生

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摘要

Mercury (Hg) speciation and the activity of Hg(Ⅱ)-methylating bacteria are responsible for the rate of methylmercury production and thus bioaccumulation in marine foodwebs. Factors affecting porewater partitioning (K_d) and methyiation of Hg(Ⅱ) were examined at 11 sites in sediment of 4 biogeochemically diverse estuaries in the Northeast U.S. In Long Island Sound, 88% of total mercury (HgT) log K_d variability was described by porewater dissolved organic carbon concentration and sediment total sulfur (S) content. Whereas across all estuaries, regression analyses showed that S alone drives about 70% of K_d variability and 50% of changes in methyiation rates; and the inclusion of DOC and sulfides did not improve the prediction. Thus, we demonstrated that S is a better predictor of HgT log K_d than the sediment organic matter across multiple estuaries, and while organic matter and S are interchangeable in small-scale studies, on a larger scale, sediment S content is the simplest and most effective variable to measure.
机译:汞(Hg)形态和甲基化Hg(Ⅱ)细菌的活性决定着甲基汞的产生速率,从而决定了海洋食物网中的生物积累。在美国东北部长岛湾的4个生物地球化学不同河口的沉积物中的11个点,研究了影响孔隙水分配(K_d)和Hg(Ⅱ)甲酰化的因素,孔隙水描述了88%的总汞(HgT)log K_d变异性溶解的有机碳浓度和沉积物总硫(S)含量。而在所有河口,回归分析表明,仅S就能驱动约70%的K_d变异性和50%的甲基化率变化。 DOC和硫化物的加入并不能改善预测。因此,我们证明,与多个河口的沉积物有机物相比,S是更好的HgT log K_d预测指标,尽管在小规模研究中有机物和S是可互换的,但从更大的角度来看,沉积物S含量是最简单,最要测量的有效变量。

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  • 来源
    《Environmental Science & Technology》 |2014年第2期|954-960|共7页
  • 作者单位

    University of Connecticut, Department of Marine Sciences, Groton, Connecticut 06340;

    University of Connecticut, Department of Marine Sciences, Groton, Connecticut 06340;

    University of Connecticut, Department of Marine Sciences, Groton, Connecticut 06340;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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