摘要：A method for the determination of fron-11 (trichlorofluoromethane), 12 (dichlorodifluoromethane), 113 (1, 1, 2-trichloro-1, 2, 2-trifluoroethane) and 114 (1, 2-dichloro-1, 1, 2, 2-tetrafluoroethane) in household aerosol products by gas chromatography was developed. For the determination of fron-11, 12 and 114, a disposable polyethylene bag was used as a sampling bag. Propelling the aerosol products in the sampling bag, the bag was warmed to vaporize fron-11, 12 and 114. The gaseous volume of the bag was measured with 1.3 l syringe and 1 ml of the gas injected to a gas chromatograph equipped with a thermal conductivity detector. In this gas chromatography, nitrogen gas was used as a carrier gas to detect only fron-species as positive peaks, while other gases as negative peaks. For the determination of fron-113, sample liquid was collected in a 100 ml beaker by propelling the aerosol products. To 1.0g of sample liquid, 1 ml of 10% bromodichloromethane hexane solution was added as an internal standard and made up to 100 ml with ethanol. One ml of the solution was diluted to 100 ml with hexane, and 1 ml of them was passed through Sep-pak [○!R] and made up to 50 ml with hexane. Five μl of the solution was injected to a gas chromatograph equipped with an electron capture detector. Recovery tests for fron-11, 12 and 114 were 87.4-104.9%, and that for fron-113 was 94.9-96.9%. By this method, 154 commercial aerosol products were analyzed, and 0.4-100.0% (w/w) of frons were determined in 45 products.
