title: The sampling and determination of halocarbons in ambient air using concentration on porous polymer.
abstract: The levels of halocarbons have been determined in rural air in central Michigan using a sampling procedure employing pre-concentration on a porous polymer. The samples were analyzed by gas chromatography (GC) with an electron capture detector. Both qualitative and quantitative confirmation of the results were achieved by GC-mass spectrometry. Trichlorofluoromethane, chloroform, 1,1,1-trichloroethane, carbon tetrachloride, trichloroethylene and perchloroethylene were determined in the range of 30-130 parts per trillion. These concentrations agree well with data obtained by others in Washington state and Ireland indicating even distribution of the halocarbons in these latitudes.
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002849:Chromatography, Gas / Q000295:instrumentation / Q000379:methods; D006846:Hydrocarbons, Halogenated / Q000032:analysis*; D007494:Ireland; D013058:Mass Spectrometry / Q000379:methods; D008824:Michigan; D014861:Washington
chemical_list: D000393:Air Pollutants; D006846:Hydrocarbons, Halogenated