Improvement of quantification and identification of atmospheric reactive mercury
Improvement of quantification and identification of atmospheric reactive mercury
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DOI：
10.1016/j.atmosenv.2020.117307
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发表时间：
2020-03
影响因子：
5
通讯作者：
A. Luippold;M. Gustin;Sarrah M. Dunham-Cheatham;Lei Zhang
中科院分区：
文献类型：
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作者：
A. Luippold;M. Gustin;Sarrah M. Dunham-Cheatham;Lei Zhang
汞（Hg）研究界需要一种方法来量化活性的、气态氧化的和颗粒结合的汞化合物。内华达大学里诺反应性汞活性系统（UNR-RMAS）旨在量化反应性汞，以及识别大气中存在的化合物。这一系统经过了重大改进，现在被指定为联合国难民救济和军事管理系统2.0。系统的物理设计、流程管理和样品分析方法都得到了改进。一个新的样品歧管增加了可靠性和一致性的空气流动。在时间分辨率和温度管理方面对热解吸法鉴定气态氧化汞化合物进行了改进。提出了一种定量测定活性汞（RM）化合物的统计方法。此外，还研究了尼龙膜上阴离子的分析，作为了解空气质量化学和潜在RM化合物的手段。通过将2018-2019年收集的UNR-RMAS 2.0样本数据与2014-2015年收集的样本数据进行比较，证明了这些改进的结果。实施的更改改善了样品复制和RM定量和物种形成的分辨率。
The mercury (Hg) research community is in need of a method to quantify reactive, gaseous oxidized, and particulate-bound Hg compounds. The University of Nevada, Reno-Reactive Mercury Active System (UNR-RMAS) was designed to quantify reactive Hg, as well as identify compounds present in the atmosphere. This system has undergone significant improvements and is now designated as UNR-RMAS 2.0. The system physical design, flow management, and sample analytical methods have been improved. A new sample manifold increased reliability and consistency of air flow. The thermal desorption method for identification of gaseous oxidized Hg compounds was improved with respect to temporal resolution and temperature management. A statistical method was developed that allows for quantifying reactive Hg (RM) compounds. In addition, analyses of anions on nylon membranes was investigated as means of understanding air mass chemistry and potential RM compounds. The results of these improvements are demonstrated through comparison of a year of UNR-RMAS 2.0 sample data collected in 2018–2019 with that collected in 2014–2015. Implemented changes resulted in improved sample replication and resolution of RM quantification and speciation.