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首页> 外文期刊>Environmental Science & Technology >Photoreducible Mercury Loss from Arctic Snow Is Influenced by Temperature and Snow Age
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Photoreducible Mercury Loss from Arctic Snow Is Influenced by Temperature and Snow Age

机译：北极雪中光可还原性汞的损失受温度和降雪年龄的影响

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摘要

Mercury (Hg) is an important environmental contaminant, due to its neurotoxicity and ability to bioaccumulate. The Arctic is a mercury-sensitive region, where organisms can accumulate high Hg concentrations. Snowpack mercury photoredox reactions may control how much Hg is transported with melting Arctic snow. This work aimed to (1) determine the significance of temperature combined with UV irradiation intensity and snow age on Hg(0) flux from Arctic snow and (2) elucidate the effect of temperature on snowpack Hg photo-reduction kinetics. Using a Teflon flux chamber, snow temperature, UV irradiation, and snow age were found to significantly influence Hg(0) flux from Arctic snow. Cross-correlation analysis results suggest that UV radiation has a direct effect on Hg(0)flux, while temperature may indirectly influence flux. Laboratory experiments determined that temperature influenced Hg photoreduction kinetics when snow approached the melting point (＞-2 ℃), where the pseudo-first-order reduction rate constant, k, decreased twofold, and the photoreduced Hg amount, Hg(Ⅱ)_(red), increased 10-fold. This suggests that temperature influences Hg photoreduction kinetics indirectly, likely by altering the solid:liquid water ratio. These results imply that large mass transfers of Hg from snow to air may take place during the Arctic snowmelt period, altering photoreducible Hg retention and transport with snow meltwater.
机译：汞（Hg）由于其神经毒性和生物蓄积能力，是一种重要的环境污染物。北极是对汞敏感的地区，生物可以在其中积聚高浓度的汞。 Snowpack汞的光氧化还原反应可以控制北极融化的雪中汞的迁移量。这项工作旨在（1）确定温度，紫外线照射强度和雪龄对北极雪中Hg（0）通量的影响，以及（2）阐明温度对积雪中Hg光还原动力学的影响。使用特氟龙助熔剂室，发现雪温，紫外线辐射和降雪年龄对北极雪中Hg（0）的通量有重大影响。互相关分析结果表明，紫外线辐射对Hg（0）通量具有直接影响，而温度可能间接影响通量。实验室实验确定，当雪达到熔点（＞ -2℃）时，温度会影响汞的光还原动力学，其中伪一级还原速率常数k下降两倍，光还原的汞量Hg（Ⅱ）_（红色），增加10倍。这表明温度可能间接影响汞的光还原动力学，可能是通过改变固液比来实现的。这些结果表明，在北极融雪期间，可能发生大量的汞从雪向空气的转移，从而改变了光可还原的汞的保留和与融雪水的运输。

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  • 来源
    《Environmental Science & Technology》 |2015年第20期|12120-12126|共7页
  • 作者

    Erin A. Mann; Mark L. Mallory; Susan E. Ziegler; Trevor S. Avery; Rob Tordon; Nelson J. ODriscoll;

  • 作者单位

    Department of Earth and Environmental Science, Acadia University, Wolfville, NS Canada,Department of Earth Science, Memorial University of Newfoundland, St. John's, NL Canada;

    Department of Biology, Acadia University, Wolfville, NS Canada;

    Department of Earth Science, Memorial University of Newfoundland, St. John's, NL Canada;

    Department of Biology, Acadia University, Wolfville, NS Canada;

    Air Quality Science Division, Environment Canada, Dartmouth, NS Canada;

    Department of Earth and Environmental Science, Acadia University, Wolfville, NS Canada;

  • 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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