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Received September 09, 1991,Revised , Accepted , Available online

Volume 5,1993,Pages 76-82

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Gas chromatography with ambient temperature injection and frozen-trapped techniques was used to determine the atmospheric concentrations of halocarbons over Beijing. Halogenated compounds such as CFC-11, CFC-12, CHCl3, CCl4, CH3CCl3, CHCl =CCl2, and CCl2=CCl2 were measured and their concentrations are 109±8, 234±13, 47±22, 97±24, 88±29, 11±1 and 17±3 (pptv), respectively.

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