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首页> 外文期刊>Environmental Science & Technology >Fate and Transport of Ambient Mercury and Applied Mercury Isotope in Terrestrial Upland Soils: Insights from the METAALICUS Watershed
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Fate and Transport of Ambient Mercury and Applied Mercury Isotope in Terrestrial Upland Soils: Insights from the METAALICUS Watershed

机译：陆地陆地土壤中环境汞和应用汞同位素的命运和运输：METAALICUS流域的见解

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摘要

The fate of mercury (Hg) deposited on forested upland soils depends on a wide array of biogeochemical and hydrological processes occurring in the soil landscape. In this study, Hg in soil, soilwater, and streamwater were measured across a forested upland subcatchment of the METAALICUS watershed in northwestern Ontario, Canada, where a stable Hg isotope (spike Hg) was applied to distinguish newly deposited Hg from Hg already resident in the watershed (ambient Hg). In total, we were able to account for 45% of the total mass of spike Hg applied to the subcatchment during the entire loading phase of the experiment, with approximately 22% of the total mass applied now residing in the top 15 cm of the mineral soil layer. Decreasing spike Hg/ambient Hg ratios with depth in the soil and soilwater suggest that spike Hg is less mobile than ambient Hg over shorter time scales. However, the transport of spike Hg into the mineral soil layer is enhanced in depressional areas where water table fluctuation is more extreme. While we expect that this pool of Hg is now effectively sequestered in the mineral horizon, future disturbance of the soil profile could remobilize this stored Hg in runoff.
机译：沉积在森林高地土壤上的汞的命运取决于土壤景观中发生的各种生物地球化学和水文过程。在这项研究中，测量了加拿大安大略省西北部METAALICUS流域的森林高地子汇水区中土壤，土壤水和河水中的Hg，在该流域的森林中，采用了稳定的Hg同位素（穗状Hg）来区分新沉积的Hg和已经存在于Hg中的Hg分水岭（环境汞）。总的来说，我们能够在实验的整个加载阶段中占施加到子汇水面积的钉状汞总量的45％，现在约占总质量的22％位于矿物的顶部15厘米土壤层。随着土壤和土壤水深的增加，峰值汞/环境汞的比率降低，表明峰值汞在较短的时间范围内比环境汞的流动性差。但是，在地下水位波动更为剧烈的depression陷地区，穗状汞向矿质土壤层的传输增加了。虽然我们希望现在已经将汞的这一汞库有效地隔离在了矿物层中，但是将来对土壤剖面的干扰可能会在径流中重新利用这些汞。

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  • 来源
    《Environmental Science & Technology》 |2014年第2期|1023-1031|共9页
  • 作者

    Claire J. Oswald; Andrew Heyes; Brian A. Branfireun;

  • 作者单位

    Department of Geography, University of Toronto Mississauga, Mississauga, Ontario L5L 1C6, Canada,School of Geography & Earth Sciences, McMaster University, Hamilton, Ontario L8S 4L8, Canada;

    Centre for Environmental Science (Chesapeake Biological Laboratory), University of Maryland, Solomons, Maryland 20688, United States;

    Department of Biology and Centre for Environment and Sustainability, University of Western Ontario, London, Ontario N6A 5B7, Canada,Department of Geography, University of Toronto Mississauga, Mississauga, Ontario L5L 1C6, 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);
  • 原文格式 PDF
  • 正文语种 eng
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