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首页> 外文期刊>Environmental Science & Technology >Sediment-Bound Inorganic Hg Extraction Mechanisms in the Gut Fluids of Marine Deposit Feeders
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Sediment-Bound Inorganic Hg Extraction Mechanisms in the Gut Fluids of Marine Deposit Feeders

机译：海洋沉积物进给器肠道流体中沉积物结合的无机汞提取机理

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摘要

The contributions of different free amino acids and proteins to the overall extraction of sediment-bound inorganic mercury (Hg) by gut fluids collected from deposit-feeding sipunculans and sea cucumbers were evaluated. The organic content and the Hg concentration in the sediment were modified to investigate their effects on Hg extraction. Cysteine was the key free amino acid in complexing Hg while proteins in the gut fluids also contributed significantly to the extraction. Different size fractions of gut fluids had different bindings with Hg at different Hg concentrations. Hg first bound with the < 10 kD and 50-100 kD fractions and then with the > 100 kD fraction when the Hg concentration was increased. Removing the organic matter (OM) from the sediments enhanced Hg extraction, indicating that competition for Hg binding between the strong binding sites in sediments (the organic matter) and gut fluids (cysteine) may control the extraction. However, Hg complexation with weak binding sites (e.g., Fe/Mn oxides) in sediments should not be ignored. We identified two sediment Hg pools with different mobilities based on Hg binding, which was influenced by the Hg concentration in the sediment and the ratio of binding sites between gut fluids and sediments. Our results help to explain the variations in gut fluid extraction and Hg bioaccumulation in different marine deposit feeders.
机译：评估了不同的游离氨基酸和蛋白质对通过沉积饲料喂养的五倍体和海参收集的肠液整体提取沉积物结合的无机汞（Hg）的贡献。修改沉积物中的有机物含量和汞浓度，以研究其对汞萃取的影响。半胱氨酸是络合汞的关键游离氨基酸，而肠液中的蛋白质也对提取具有重要作用。在不同的汞浓度下，不同大小的肠液与汞的结合力也不同。当Hg浓度增加时，Hg首先与<10 kD和50-100 kD的馏分结合，然后与> 100 kD的馏分结合。从沉积物中去除有机物（OM）增强了汞的提取，表明在沉积物（有机物）和肠液（半胱氨酸）的强结合位点之间竞争汞结合可能会控制提取。但是，不应忽略沉积物中汞结合力弱的结合位点（例如Fe / Mn氧化物）。基于汞的结合，我们确定了两个具有不同迁移率的沉积物汞池，这受沉积物中的汞浓度以及肠液和沉积物之间结合位点的比率的影响。我们的结果有助于解释不同海洋沉积物进料器中肠液提取和汞生物富集的变化。

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  • 来源
    《Environmental Science & Technology》 |2006年第19期|p.5181-6186|共1006页
  • 作者

    HUAN ZHONG; WEN-XIONG WANG;

  • 作者单位

    Atmospheric, Marine and Coastal Environment Program and Department of Biology, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong;

  • 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
  • 中图分类 环境化学;
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