Abstract
A search for and analysis of 19 simple halocarbons in the atmosphere of the rural Northwest U.S.A. is reported. The only previously unreported halocarbon found was methyl chloride, but its concentration is relatively large, 530 ± 30 ppt ∗ ∗ 1 ppt = 10 -12 by vol. The analyses of other chlorocarbons detected were in good agreement with previously reported background levels. The background concentrations of chlorofluorocarbons were found to be significantly higher than values obtained by others using electron capture gas chromatography. Chlorocarbons are concluded to be more important carriers of chlorine atoms in the troposphere than chlorofluorocarbons at this time. The quantitation obtained from gc-ms measurements indicates that chlorofluorocarbons constitute ca. 36 per cent of the total organic chloride budget of the atmosphere.
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