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首页> 外文期刊>Environmental Science & Technology >Divalent Mercury in Dissolved Organic Matter Is Bioavailable to Fish and Accumulates as Dithiolate and Tetrathiolate Complexes
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Divalent Mercury in Dissolved Organic Matter Is Bioavailable to Fish and Accumulates as Dithiolate and Tetrathiolate Complexes

机译：鱼类可生物利用溶解的有机物中的二价汞，并以二硫醇盐和四硫醇盐复合物形式积累

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摘要

The freshwater cyprinid Tanichthys albonubes was used to assess the bioavailability of divalent mercury (Hg(II)) complexed in dissolved organic matter (DOM) to fish. The fish acquired 0.3 to 2.2 mu g Hg/g dry weight after 8 weeks in aquaria containing DOM from a Carex peat with complexed mercury at initial concentrations of 14 nM to 724 nM. Changes in the relative proportions of dithiolate Hg(SR)(2) and nanoparticulate beta-HgS in the DOM, as quantified by high energy-resolution XANES (HR-XANES) spectroscopy, indicate that Hg(SR)(2) complexes either produced by microbially induced dissolution of nanoparticulate beta-HgS in the DOM or present in the original DOM were the forms of mercury that entered the fish. In the fish with 2.2 mu g Hg/g, 84 +/- 8% of Hg(II) was bonded to two axial thiolate ligands and one or two equatorial N/O electron donors (Hg[(SR)(2)+(N/O)(1-2)] coordination), and 16% had a Hg(SR)(4) coordination, as determined by HR-XANES. For comparison, fish exposed to Hg2+ from 40 nM HgCl2 contained 10.4 mu g Hg/g in the forms of dithiolate (20 +/- 10%) and tetrathiolate (23 +/- 10%) complexes, and also HgxSy clusters (57 +/- 15%) having a beta-HgS-type local structure and a dimension that exceeded the size of metallothionein clusters. There was no evidence of methylmercury in the fish or DOM within the 10% uncertainty of the HR-XANES. Together, the results indicate that inorganic Hg(II) bound to DOM is a source of mercury to biota with dithiolate Hg(SR)(2) complexes as the immediate species bioavailable to fish, and that these complexes transform in response to cellular processes.
机译：淡水鲤类鱼类Tanichthys albonubes用于评估溶解于有机物（DOM）中的二价汞（Hg（II））对鱼类的生物利用度。在含有DOM的Carex泥炭中，含有DOM的水族箱中含有DOM的鱼在8周后的干重为0.3-2.2μg Hg / g，初始浓度为14 nM-724 nM。通过高能分辨XANES（HR-XANES）光谱法定量，二硫代Hg（SR）（2）和纳米颗粒β-HgS在DOM中的相对比例的变化表明，Hg（SR）（2）络合物均产生通过微生物诱导的纳米颗粒β-HgS在DOM中或原始DOM中的溶解，是进入鱼类的汞形式。在具有2.2μg Hg / g的鱼中，84 +/- 8％的Hg（II）与两个轴向硫醇盐配体和一个或两个赤道N / O电子供体（Hg [（SR）（2）+（ N / O）（1-2）]协调），根据HR-XANES的测定，有16％的Hg（SR）（4）协调。为了进行比较，从40 nM HgCl2中暴露于Hg2 +的鱼以二硫醇盐（20 +/- 10％）和四硫醇盐（23 +/- 10％）复合物以及HgxSy簇（57 + -/-15％）具有β-HgS型局部结构，其尺寸超过了金属硫蛋白簇的大小。在HR-XANES的10％不确定性范围内，没有鱼类或DOM中甲基汞的证据。总之，结果表明，与DOM结合的无机Hg（II）是汞的生物来源，二硫代Hg（SR）（2）配合物是鱼类可直接利用的生物物种，这些配合物响应细胞过程而转化。

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  • 来源
    《Environmental Science & Technology》 |2019年第9期|4880-4891|共12页
  • 作者

    Bourdineaud Jean-Paul; Gonzalez-Rey Maria; Rovezzi Mauro; Glatzel Pieter; Nagy Kathryn L.; Manceau Alain;

  • 作者单位

    Univ Bordeaux, Inst Europeen Chim & Biol, CNRS, 2 Rue Escarpit, F-33607 Pessac, France;

    Univ Bordeaux, CNRS, Lab EPOC, F-33120 Arcachon, France;

    ESRF, 71 Rue Martyrs, F-38000 Grenoble, France;

    ESRF, 71 Rue Martyrs, F-38000 Grenoble, France;

    Univ Illinois, Dept Earth & Environm Sci, MC 186,845 West Taylor St, Chicago, IL 60607 USA;

    Univ Grenoble Alpes, ISTerre, CNRS, F-38000 Grenoble, France;

  • 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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