大气中活性气态汞的分析方法和赋存转化

活性气态汞(Reactive gaseous mercury,RGM),在大气环境中通常被认为是气态的氧化汞,主导大气汞沉降过程,对汞的全球循环至关重要.本文详细介绍了RGM的多种采样和分析方法,讨论并比较了当前技术的优势和局限性;对RGM在大气中的生成、赋存、清除等环境过程以及相关的机制进行了梳理,并探究各过程在大气...

Analysis Methods,Occurrence, and Transformation of Reactive Gaseous Mercury in the Atmosphere

Reactive gaseous mercury(RGM), also known as gaseous oxidized mercury, dominates atmospheric mercury deposition and is critical to the global cycle of mercury. This review introduces various sampling and analysis methods of RGM in detail, and discusses the advantages and limitations of the current techniques. The environmental processes including the formation, occurrence, and depletion of RGM in the atmosphere and related mechanisms are reviewed, and the contribution of each process in the atmospheric mercury cycle is explored. In view of the current analytical difficulties of RGM(e.g., ultralow concentration and sampling problems) and key scientific issues(e.g., chemical form and transformation) in the RGM research, efforts should be made to develop the feasible methods for RGM collection and speciation determinatiton in the real environment, so as to further explore its environmental behavior. This is challenging but important for the research of atmospheric mercury and will be helpful for understanding the role of RGM in cycle processes of atmospheric mercury.