METODS FOR AIR CONTROL IN URBANIZED AREAS BY MARKER SUBSTANCES FORMED AT PETROCHEMICAL ENTERRISES
The analytical review provides data on foreign and domestic analytical techniques and methods used in the chemical-analytical control of the content in the air of markers substances of organic synthesis. The conducted analysis of the scientific and methodological literature made it possible to conclude that the majority of modern methods for the determination of potentially hazardous chemical compounds of carcinogens - 1,3-butadiene and ethylene oxide in the air in the Russian Federation are characterized by insufficient selectivity, low sensitivity and laboriousness of preparing air samples for chemical analysis. Methods for the quantitative determination of 1,3-butadiene and ethylene oxide in air using high-performance capillary gas chromatography are described in foreign literature. A photoionization detector is used as a detector, which is characterized by high sensitivity to 1,3-butadiene and ethylene oxide. The minimum concentration of 1,3-butadiene detected in air using a photoionization detector is 6.1 μg/m<sup>3</sup>. At present, in the chemical analysis of foreign analytical laboratories, gas chromatography-mass spectrometric methods are widely used, which are most effective in the analysis of complex mixtures of organic compounds and allow not only to separate all components of the mixture, but also to confirm the structure of the studied components by the identification method using mass spectral data libraries. Analysis of scientific domestic and foreign literature showed that developers pay special attention to sampling 1,3-butadiene and ethylene oxide from air, which increases the sensitivity and improve the metrological characteristics of the determination.