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Results of measurements of fluorinated compounds in gasses extracted from igneous and metamorphic rocks are reported. A new extraction method analogous to a pepper mill for geological samples is described. It permits extraction at low temperatures and ensures a rapid transfer of extracted gases from active surfaces to cryogenic pre‐concentration loop. Values for CF 4 , CF 3 Cl, CF 2 Cl 2 , CFCl 3 , CHF 3 , SF 6 and NF 3 in fluorites, granites, basalts and other igneous and metamorphic rocks are reported. It is proposed that trifluoroacetic acid (TFA) that was recently discovered in various environmental archives could also origin from similar geogenic sources.
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Harnisch et al. (2000) studied this question.
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