A GAS CHROMATOGRAPHIC DETERMINATION OF CHLOROPRENE IN ATMOSPHERIC AIR, INDUSTRIAL EMISSIONS, AND INWORKING AREA AIR
Chloroprene is widely used throughout the world in the production of synthetic rubber. In this regard, the development of modern methods for the determination of this hydrocarbon is a very urgent task. The approaches to the chloroprene content analysis of atmospheric air, the air in the working area, industrial emissions into the atmosphere have been studied in the work. The development and validation of the method for the determination of chloroprene in air by gas chromatography on a hardware-software complex based on the chromatograph "Chromatek-Crystal 5000" complete with a flame ionization detector, hydrogen generator, thermal desorber was carried out. The working conditions for the gas chromatographic determination of chloroprene were established using a CR-Vol capillary column 3 = 60 m long, 0.53 mm in diameter (phase composition, cyanopropylphenyl polysylphenylene siloxane), with a stationary phase layer thickness of 3.0 μm; nitrogen was used as a carrier gas at a flow rate of 15 ml / min. The volume of the injected sample was 1 μL, the evaporator temperature was 200 ° C, the temperature of the column thermostat was 70 ° C, the hydrogen flow rate was 50 ml / min, the air flow rate was 500 ml / min, and the chloroprene retention time was 8.415 min. Samples are taken on sorption tubes 6.236.224 (combined Tenax / Carbopack B / Carbosieve S III). The chromatograph was calibrated at 4 points, control measurements and statistical processing of the analysis results were carried out. The lower limit of the measurement range is 0.001 mg / m3 with a sample volume of 10 dm3. The standard deviation of the measurement results under repeatability conditions is assumed to be 3%. The expanded uncertainty of the results of chloroprene measurements at a coverage factor of k = 2, corresponding to a confidence level of P = 0.95, was 16.4%.