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首页> 外文期刊>Environmental Science & Technology >Elevated Trimethylarsine Oxide and Inorganic Arsenic in Northern Hemisphere Summer Monsoonal Wet Deposition
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Elevated Trimethylarsine Oxide and Inorganic Arsenic in Northern Hemisphere Summer Monsoonal Wet Deposition

机译：北半球夏季季风湿沉降中三甲基Tri氧化物和无机砷的升高

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摘要

For arsenic speciation, the inputs for wet deposition are not well understood. Here we demonstrate that trimethylarsine oxide (TMAO) and inorganic arsenic are the dominant species in monsoonal wet deposition in the summer Indian subcontinent, Bangladesh, with inorganic arsenic dominating, accounting for ~80% of total arsenic in this medium. Lower concentrations of both species were found m monsoonal wet deposition in the winter Indian subcontinent, Sri Lanka. The only other species present was dimethylarsinic acid (DMAA), but this was usually below limits of detection (LoD). We hypothesize that TMAO and inorganic arsenic in monsoonal wet deposition are predominantly of marine origin. For TMAO, the potential source is the atmospheric oxidation of marine derived trimethylarsine. For inorganic arsenic, our evidence suggests entrainment of water column inorganic arsenic into atmospheric particulates. These conclusions are based on weather trajectory analysis and on the strong correlations with known wet deposition marine derived elements: boron, iodine, and selenium. The finding that TMAO and inorganic arsenic are widely present and elevated in monsoonal wet deposition identifies major knowledge gaps that need to be addressed regarding the understanding of arsenic's global cycle.
机译：对于砷形态而言，对于湿法沉积的投入还知之甚少。在这里，我们证明了三甲基氧化砷（TMAO）和无机砷是夏季印度次大陆孟加拉国季风湿沉降中的主要物种，其中无机砷占主导地位，约占该介质中总砷的80％。在冬季印度次大陆斯里兰卡季风湿沉降中发现这两种物种的浓度都较低。存在的唯一其他物种是二甲基ar酸（DMAA），但这通常低于检出限（LoD）。我们假设季风湿沉降中的TMAO和无机砷主要来自海洋。对于TMAO，潜在的来源是海洋衍生的三甲基ar的大气氧化。对于无机砷，我们的证据表明将水柱无机砷夹带到大气颗粒中。这些结论基于天气轨迹分析，并与已知的湿法沉积海洋衍生元素（硼，碘和硒）具有很强的相关性。 TMAO和无机砷在季风湿沉降中广泛存在并升高的发现确定了在理解砷全球循环方面需要解决的主要知识空白。

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  • 来源
    《Environmental Science & Technology》 |2017年第21期|12210-12218|共9页
  • 作者

    Laurie Savage; Manus Carey; Mahmud Hossain; M. Rafiqul Islam; P. Mangala C. S. de Silva; Paul N. Williams; Andrew A. Meharg;

  • 作者单位

    Institute for Global Food Security, Queen's University Belfast, David Keir Building, Malone Road, Belfast BT9 5BN, Northern Ireland;

    Institute for Global Food Security, Queen's University Belfast, David Keir Building, Malone Road, Belfast BT9 5BN, Northern Ireland;

    Bangladesh Agricultural University, Mymensingh 2202, Bangladesh;

    Bangladesh Agricultural University, Mymensingh 2202, Bangladesh;

    Department of Zoology, Faculty of Science, University of Ruhuna, Matara 81170, Sri Lanka;

    Institute for Global Food Security, Queen's University Belfast, David Keir Building, Malone Road, Belfast BT9 5BN, Northern Ireland;

    Institute for Global Food Security, Queen's University Belfast, David Keir Building, Malone Road, Belfast BT9 5BN, Northern Ireland;

  • 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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