total gaseous mercury (TGM)
TGM is a mercury fraction operationally defined as species passing
through a 0.45 µm filter or some other simple filtration device such as
quartz wool plugs, and which are collected on gold or other collection
material. TGM is mainly composed of elemental mercury vapor with minor
fractions of other volatile species such as HgCl2, CH3HgCl or (CH3)2Hg.
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