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首页> 外文期刊>Environmental Science & Technology >Sources of Methylmercury to Snowpacks of the Alberta Oil Sands Region: A Study of In Situ Methylation and Particulates
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Sources of Methylmercury to Snowpacks of the Alberta Oil Sands Region: A Study of In Situ Methylation and Particulates

机译：阿尔伯塔省油砂地区积雪中的甲基汞来源：原位甲基化和微粒研究

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src="http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-2/acs.est.7b04096/20180111/images/medium/es-2017-04096h_0005.gif">Snowpacks in the Alberta Oil Sands Region (AOSR) of Canada contain elevated loadings of methylmercury (MeHg; a neurotoxin that biomagnifies through foodwebs) due to oil sands related activities. At sites ranging from 0 to 134 km from the major AOSR upgrading facilities, we examined sources of MeHg by quantifying potential rates of MeHg production in snowpacks and melted snow using mercury stable isotope tracer experiments, as well as quantifying concentrations of MeHg on particles in snowpacks (pMeHg). At four sites, methylation rate constants were low in snowpacks (km = 0.001–0.004 d–1) and nondetectable in melted snow, except at one site (km = 0.0007 d–1). The ratio of methylation to demethylation varied between 0.3 and 1.5, suggesting that the two processes are in balance and that in situ production is unlikely an important net source of MeHg to AOSR snowpacks. pMeHg concentrations increased linearly with distance from the upgraders (R2 = 0.71, p < 0.0001); however, snowpack total particle and pMeHg loadings decreased exponentially over this same distance (R2 = 0.49, p = 0.0002; R2 = 0.56, p < 0.0001). Thus, at near-field sites, total MeHg loadings in snowpacks were high due to high particle loadings, even though particles originating from industrial activities were not MeHg rich compared to those at remote sites. More research is required to identify the industrial sources of snowpack particles in the AOSR.
机译：src =“ http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-2/acs.est.7b04096/20180111/images/medium /es-2017-04096h_0005.gif“>由于油砂相关的活动，加拿大艾伯塔省油砂地区（AOSR）的雪袋中甲基汞（MeHg；一种通过食物网进行生物放大的神经毒素）的甲基汞含量较高。在距主要AOSR升级设施0至134 km的范围内，我们通过使用汞稳定同位素示踪剂实验量化了积雪和融雪中潜在的MeHg产生速率，以及量化了积雪中颗粒上的MeHg浓度，从而检测了MeHg的来源（pMeHg）。在四个位置，积雪中的甲基化速率常数较低（ k m = 0.001–0.004 d -1 ），在融雪中无法检测到，除了在一个站点上（ k m = 0.0007 d –1 ）。甲基化与脱甲基化之比在0.3到1.5之间变化，这表明这两个过程处于平衡状态，并且原位生产不太可能是MeHg到AOSR积雪的重要净来源。 pMeHg浓度随离升级子的距离而线性增加（R 2 = 0.71， p <0.0001）；但是，在同一距离内，积雪的总颗粒和pMeHg的装载量呈指数下降（R 2 = 0.49， p = 0.0002； R 2 = 0.56， p <0.0001）。因此，在近场现场，由于颗粒物含量高，雪堆中的总MeHg含量高，即使与远距离现场相比，工业活动产生的颗粒物的MeHg含量也不高。需要更多的研究来确定AOSR中积雪颗粒的工业来源。

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  • 来源
    《Environmental Science & Technology》 |2018年第2期|531-540|共10页
  • 作者

    Chelsea E. Willis; Jane L. Kirk; Vincent L. St. Louis; Igor Lehnherr; Parisa A. Ariya; Rodrigo Benjamin Rangel-Alvarado;

  • 作者单位

    Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada;

    Aquatic Contaminants Research Division, Environment and Climate Change Canada, Burlington, Ontario L7S 1A1, Canada;

    Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2E9, Canada;

    Department of Geography, University of Toronto Mississauga, Mississauga, Ontario L5L 1C6, Canada;

    Department of Atmospheric & Oceanic Sciences and Department of Chemistry, McGill University, Montréal, Québec H3A 2K6, Canada;

    Department of Atmospheric & Oceanic Sciences and Department of Chemistry, McGill University, Montréal, Québec H3A 2K6, 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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