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Comparison of 4 Methods for Measurement of Reactive, Gaseous Oxidized, and Particulate Bound Mercury

机译:四种测量反应性,气态氧化和颗粒结合汞的方法的比较

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摘要

The atmosphere is an important (1) pathway by which mercury (Hg) is transported around the globe and (2) source of Hg to ecosystems. Thus, understanding Hg atmospheric chemistry is critical for understanding the biogeochemical cycle and impacts to human and ecosystem health. Work over the past 13 years has demonstrated that the standard instrument used to measure atmospheric Hg does not accurately quantify gaseous oxidized mercury (GOM) or particulate bound mercury (PBM). This study focused on comparing four methods for quantifying atmospheric Hg and identifying Hg(II) compounds. Data from two automated systems, the Tekran 2537/1130 system and the University of Nevada, Reno-Dual Channel System (DCS), were compared with two University of Nevada, Reno-Reactive Mercury Active Systems (RMAS 2.0). One RMAS 2.0 included cation exchange membranes (CEMs) and nylon membranes, and the second included a polytetrafluoroethylene (PTFE) membrane upstream of the CEM and nylon membranes. The Tekran system and the DCS underestimated GOM concentrations with respect to that measured using the RMAS 2.0. The RMAS 2.0 with the upstream PTFE provided a means of distinguishing GOM and PBM. Thermal desorption of nylon membrane data identified a variety of GOM and PBM compounds present.
机译:大气层是重要的途径(1)汞(Hg)在全球范围内的传播途径,以及(2)汞来源到生态系统。因此,了解汞大气化学对于了解生物地球化学循环及其对人类和生态系统健康的影响至关重要。过去13年的工作表明,用于测量大气中Hg的标准仪器无法准确地量化气态氧化汞(GOM)或颗粒结合汞(PBM)。这项研究的重点是比较四种定量大气Hg和鉴定Hg(II)化合物的方法。将两个自动化系统Tekran 2537/1130系统和内华达大学里诺双通道系统(DCS)的数据与两个内华达大学里诺反应型汞主动系统(RMAS 2.0)进行了比较。一种RMAS 2.0包括阳离子交换膜(CEM)和尼龙膜,第二种RMAS 2.0包括在CEM和尼龙膜上游的聚四氟乙烯(PTFE)膜。相对于使用RMAS 2.0测量的浓度而言,Tekran系统和DCS低估了GOM浓度。带有上游PTFE的RMAS 2.0提供了区分GOM和PBM的方法。尼龙膜数据的热脱附确定了存在的各种GOM和PBM化合物。

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  • 来源
    《Environmental Science & Technology》 |2019年第24期|14489-14495|共7页
  • 作者单位

    Univ Nevada Dept Nat Resources & Environm Sci Reno NV 89557 USA;

    Nanjing Univ Sch Environm Nanjing 210023 Jiangsu Peoples R China;

  • 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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