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Maritime Deposition of Organic and Inorganic Arsenic

机译：有机和无机砷的海上沉积

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摘要

The speciation of arsenic in wet and dry deposition are ambiguously described in current literature. Presented here is a 2 year study quantifying arsenic species in atmospheric deposition collected daily from an E. Atlantic coastal, semirural site, with comparative urban locations. Inorganic arsenic (Asi) was the principal form of arsenic in wet deposition, with a mean concentration of 0.54 mu mol/m(3). Trimethylarsine oxide (TMAO) was found to be the dominant form of organic arsenic, determined as above the LoD in 33% of wet deposition samples with a mean concentration of 0.12 mu mol/m(3). Comparison with codeposited trace elements and prevailing weather trajectories indicated that both anthropogenic and marine sources contribute to atmospheric deposition. Analysis of dry deposition revealed it to be a less significant input to the land-surface for As ; , contributing 32% of that deposited by wet deposition. Dry deposition had a larger proportion of As, than that found in wet deposition, with TMAO making up only 12% of the sum of species. In comparison, urban sites showed large spatial and temporal variations in organic arsenic deposition, indicating that local sources of methylated species may be likely and that further understanding of biogenic arsine evolution and degradation are required to adequately assess the atmospheric arsenic burden and subsequent contribution to terrestrial ecosystems.
机译：在当前文献中，湿润和干沉积中砷的形状模糊地描述。这里提出了一项2年的研究，该研究在每天从E.大西洋沿海，神话场所收集的大气沉积中的砷物种，具有比较城市地点。无机砷（ASI）是湿沉积中砷的主要形式，平均浓度为0.54μmol/ m（3）。将氧化三甲胂氧化物（TMAO）被发现是有机砷的主要形式，如上所述，在33％的湿沉积样品中测定，平均浓度为0.12μmol/ m（3）。与补充迹线元素和普遍天气轨迹的比较表明，人为和海洋来源都有助于大气沉积。干沉积分析显示为陆地表面的较差输入。 ，有助于湿沉积沉积的32％。干沉积比在湿沉积中发现的比例较大，TMAO仅占物种总和的12％。相比之下，城市遗址在有机砷沉积中表现出大量的空间和时间变化，表明甲基化物种的局部来源可能是可能的，并且需要进一步了解生物原毒素演化和降解，以充分评估大气砷负担和随后对陆地的贡献生态系统。

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  • 来源
    《Environmental Science & Technology》 |2019年第13期|7288-7295|共8页
  • 作者

    Savage Laurie; Carey Manus; Williams Paul N.; Meharg Andrew A.;

  • 作者单位

    Queens Univ Belfast Inst Global Food Secur David Keir Bldg Malone Rd Belfast BT9 5BN Antrim North Ireland;

    Queens Univ Belfast Inst Global Food Secur David Keir Bldg Malone Rd Belfast BT9 5BN Antrim North Ireland;

    Queens Univ Belfast Inst Global Food Secur David Keir Bldg Malone Rd Belfast BT9 5BN Antrim North Ireland;

    Queens Univ Belfast Inst Global Food Secur David Keir Bldg Malone Rd Belfast BT9 5BN Antrim North 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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