Abstract 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.

中文翻译：

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大气活性汞定量鉴定的改进

摘要 汞 (Hg) 研究界需要一种方法来量化反应性、气态氧化和颗粒结合的 Hg 化合物。内华达大学 Reno-Reactive Mercury Active System (UNR-RMAS) 旨在量化反应性汞，以及识别大气中存在的化合物。该系统经历了重大改进，现在被指定为 UNR-RMAS 2.0。系统物理设计、流程管理和样品分析方法都得到了改进。新的样品歧管提高了气流的可靠性和一致性。用于识别气态氧化汞化合物的热解吸方法在时间分辨率和温度管理方面得到了改进。开发了一种统计方法，可以对活性汞 (RM) 化合物进行定量。此外，研究了尼龙膜上阴离子的分析，作为了解气团化学和潜在 RM 化合物的手段。通过将 2018-2019 年收集的一年 UNR-RMAS 2.0 样本数据与 2014-2015 年收集的数据进行比较，证明了这些改进的结果。实施的更改提高了样品复制和 RM 定量和物种形成的分辨率。