METHOD FOR SIMULTANEOUS MEASUREMENT OF CONCENTRATION OF BENZENE, TOLUENE AND XYLENE VAPOUR IN GASEOUS MIXTURE USING BF2DBM-BASED MATERIALS Russian patent published in 2014 - IPC G01N21/64 

FIELD: chemistry.

SUBSTANCE: invention can be used when determining content of benzene, toluene and xylene (BTX) vapour in urban air, air in residential facilities, chemical laboratories, filling stations and oil processing enterprises, in gas emissions of industrial plants. The method of determining concentration of benzene, toluene and xylene vapour in a gaseous mixture comprises placing material containing boron difluoride dibenzoylmethane (BF2DBM) fluorophore or a methyl- or methoxy derivative thereof into the gas mixture, illuminating the material with light in the wavelength range of 355-400 nm and measuring fluorescence intensity of the material in the wavelength range of 400-550 nm. Unlike the existing method, measurement is carried out on not less than two spectral channels, wherein the number of channels is selected not less than the number of determined components in the mixture plus one. The measured values are then used to calculate relative intensity of spectra of the fluorophore and exciplexes thereof with benzene, toluene and xylene. Concentration of benzene, toluene and xylene is then determined from the ratio of intensities of the corresponding exciplex to the intensity of BF2DBM.

EFFECT: simultaneous continuous selective measurement of benzene, toluene and xylene in gaseous mixtures in a wide range of concentrations with short reaction time.

2 cl, 4 dwg, 1 tbl