natioThis analytical method is a validated measurement procedure for the determin of vinyl chloride [75-01-4] in workplace air averaged over the sampling period after personal or stationary sampling. Sampling is performed by drawing a defined volume of air through an adsorption tube filled with carbon black and a carbon molecular sieve using a suitable flow-regulated pump. The flow rate is set to 20 ml/min with a recommended air sample volume of 1.2 l (which corresponds to a sampling period of 60 min). After thermal desorption at 300 °C the sample is analysed by means of GC with a flame ionisation detector (FID) or preferably with a mass spectrometric detector (MSD). The relative limit of quantification (LOQ) is 0.00023 mg/m³ vinyl chloride for an air sample volume of 1.2 l. The mean recovery was 93% for an evaluation with MSD and the expanded uncertainty for vinyl chloride was 15% over the entire measurement
range. This method has been tested and recommended for the determination of vinyl chloride in workplaces by the German Social Accident Insurance. Both personal and stationary sampling can be performed for measurements for the evaluation of work areas.