[Determination of vinyl chloride in the air by the gas chromatography method].

The purpose of the paper was to work out a gas chromatographic method for determination of vinyl chloride in the air at work places in the chemical plants. The best results have been obtained at 50 degrees C on 3-meter column containing 10% SE-30 on Chromosorb W AW DMCS, 80--100 mesh. Two methods of sampling have been considered: that of collecting samples in vacuum pipettes and that of adsorption on charcoal. In the former method stability of collected samples has been investigated (Fig. 3). A slight decrease in concentration of the vinyl chloride (approximately 3%) was found in four hours. In the latter method two ways of determination of vinyl chloride desorption coefficient from charcoal have been investigated. Since no essential difference in values of desorption coefficient has been observed, both ways for determination of desorption coefficient may be employed. A modified device for preparation of standard concentrations of vinyl chloride in the air has been utilized in our research (Fig. 2). The relative standard deviation resulting from analysis of samples was +/- 0.075. The minimum determinable amount of vinyl chloride was found to be 10 ng per injection.