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Stability of Dimethyl Mercury in Seawater and Its Conversion to Monomethyl Mercury

机译：海水中二甲基汞的稳定性及其转化为单甲基汞

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摘要

Dimethyl mercury (DMHg) is commonly detected in the world's oceans, but little is known about the mechanisms responsible for DMHg degradation in natural waters or the products of this degradation. Similarly, the potential for the conversion of DMHg to monomethyl mercury (MMHg) under the acidic conditions commonly used to preserve samples for MMHg analysis has not been fully addressed. We provide evidence suggesting that DMHg in natural seawater is not readily photodegraded by sunlight as previously thought. Other experiments demonstrated that DMHg in seawater is, however, readily decomposed under acidic conditions, with MMHg as the predominant product.This facile conversion of DMHgto MMHg at low pH both necessitates an alternative preservation method to acidification for samples to be analyzed for MMHg when DMHg is present, and requires that data from previous studies of MMHg in seawater employing sample acidification be revisited in instances where appreciable DMHg concentrations were possible.
机译：二甲基汞（DMHg）通常在世界海洋中被检测到，但是对于造成天然水中DMHg降解的机理或这种降解产物知之甚少。同样，尚未完全解决在通常用于保存样品进行MMHg分析的酸性条件下DMHg转化为一甲基汞（MMHg）的可能性。我们提供的证据表明，天然海水中的DMHg不会像以前所认为的那样容易被阳光光降解。其他实验表明，海水中的DMHg在酸性条件下很容易分解，而MMHg是主要产物.DMHg在低pH值下容易转化为MMHg都需要另一种保存方法，即酸化DMHg时要分析的MMHg样品。目前存在，要求在可能的DMHg浓度可能较高的情况下，重新审查以前使用样品酸化方法对海水中MMHg进行研究的数据。

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  • 来源
    《Environmental Science & Technology》 |2009年第11期|4056-4062|共7页
  • 作者

    FRANK J.BLACK; CHRISTOPHER H.CONAWAY; A.RUSSELL FLEGAL;

  • 作者单位

    WIGS Laboratory, Department of Environmental Toxicology,University of California, Santa Cruz, California 95064 Henry Oppenheimer Okavango Research Centre, University of Botswana, Private Bag 285, Maun, Botswana;

    WIGS Laboratory, Department of Environmental Toxicology,University of California, Santa Cruz, California 95064;

    WIGS Laboratory, Department of Environmental Toxicology,University of California, Santa Cruz, California 95064;

  • 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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