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首页> 外文期刊>Environmental Science & Technology >How Might Selenium Moderate the Toxic Effects of Mercury in Stream Fish of the Western U.S.?
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How Might Selenium Moderate the Toxic Effects of Mercury in Stream Fish of the Western U.S.?

机译：硒如何减轻汞在美国西部溪流鱼类中的毒性作用？

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The ability of selenium (Se) to moderate mercury (Hg) toxicity is well established in the literature. Mercury exposures that might otherwise produce toxic effects are counteracted by Se, particularly when Se:Hg molar ratios approach or exceed 1. We analyzed whole body Se and Hg concentrations in 468 fish representing 40 species from 137 sites across 12 western U.S. states. The fish samples were evaluated relative to a published wildlife protective Hg threshold (0.1 μg Hg·g~(-1) wet wt.),the currenttissue based methylmercury(MeHg) water quality criterion (WQC) for the protection of humans (0.3μg Hg·g~(-1) wet wt.) and to presumed protections against Hg toxicity when Se:Hg molar ratios are >1.A large proportion (56%) of our total fish sample exceeded the wildlife Hg threshold, whereas a smaller, but significant proportion (12%), exceeded the MeHg WQC. However, 97.5% of the total fish sample contained more Se than Hg (molar ratio >1) leaving only 2.5% with Se: Hg ratios <1. All but one of the fish with Se:Hg <1, were of the genus Ptychochelius (pikeminnow). Scientific literature on Se counteracting Hg toxicity and our finding that 97.5% of the freshwater fish in our survey have sufficient Se to potentially protect them and their consumers against Hg toxicity suggests that Se in fish tissue (Se:Hg molar ratio) must be considered when assessing the potential toxic effects of Hg.
机译：硒对中等汞（Hg）毒性的能力已在文献中充分确立。 Se可以抵消汞暴露，否则汞可能会产生毒性作用，尤其是当Se：Hg摩尔比接近或超过1时。我们分析了美国西部12个州137个地点的468种鱼类的40种鱼的全身硒和汞浓度。相对于已公布的野生动物保护性Hg阈值（0.1μgHg·g〜（-1）湿重），当前组织中用于保护人类的甲基汞（MeHg）水质标准（WQC）对鱼类样品进行了评估（0.3μg （Hg·g〜（-1）湿重），并且当Se：Hg摩尔比大于1时可以防止汞的毒性。在我们的总鱼类样品中，有很大一部分（56％）超过了野生动物的汞阈值，但有很大一部分（12％）超过了MeHg WQC。然而，鱼总样本中有97.5％的硒比汞高（摩尔比> 1），而硒：汞比<1仅占2.5％。 Se：Hg <1的鱼中，只有一条是Ptychochelius（pikeminnow）属。有关硒抵抗汞毒性的科学文献，以及我们的调查结果表明，在我们的调查中，有97.5％的淡水鱼具有足够的硒来潜在地保护它们，其消费者也免受汞毒性的影响，这表明在以下情况下必须考虑鱼组织中的硒（硒：汞摩尔比）评估汞的潜在毒性作用。

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  • 来源
    《Environmental Science & Technology》 |2009年第10期|3919-3925|共7页
  • 作者

    SPENCER A PETERSON; NICHOLAS V.C. RALSTON; DAVID V PECK; JOHN VAN SICKLE; J. DAVID ROBERTSON; VICKIE L. SPATE; J. STEVEN MORRIS;

  • 作者单位

    National Health and Environmental Effects Research Laboratory, Western Ecology Division, U.S. Environmental Protection Agency, Corvallis, Oregon 97333;

    Energy and Environmental Research Center, University of North Dakota, 15 North 23rd Street, Stop 9018, Grand Forks, North Dakota 58202-9018;

    National Health and Environmental Effects Research Laboratory, Western Ecology Division, U.S. Environmental Protection Agency, Corvallis, Oregon 97333;

    National Health and Environmental Effects Research Laboratory, Western Ecology Division, U.S. Environmental Protection Agency, Corvallis, Oregon 97333;

    Department of Chemistry and Research Reactor, Room 209A, University of Missouri, Research Park Drive, Columbia, Missouri 65211;

    Department of Chemistry and Research Reactor, Room 209A, University of Missouri, Research Park Drive, Columbia, Missouri 65211;

    Department of Chemistry and Research Reactor, Room 209A, University of Missouri, Research Park Drive, Columbia, Missouri 65211;

  • 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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