reactive gas phase mercury (RGM)
RGM is defined as water-soluble mercury species with sufficiently high vapor pressure to exist in the gas phase. The reactive term refers to the capability of stannous chloride to reduce these species in aqueous solution without pretreatment. The most likely candidate for RGM species is HgCl2 and possibly other divalent mercury species. RGM is deposited readily in rainfall.
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