METHOD FOR DETERMINING MICRO-CONCENTRATIONS OF ETHYL SPIRITS IN STEAM-GAS MIXTURES Russian patent published in 2008 - IPC G01N27/00 G01N31/00 

FIELD: analytical chemistry, possible use for determining concentrations of ethyl spirits in steam-gas mixtures using an array of piezo-electric quartz resonators with films.

SUBSTANCE: method for determining micro-concentrations of ethyl spirits in steam-gas mixtures includes extracting 3-5 cm³ of analyzed steam-gas mixture, injecting the sample into closed detection cell, on the lid of which 3 piezo-electric quartz resonators are mounted with base frequency of 40 Mhz, onto electrodes of which on two sides solutions are applied, respectively, polyethylene glycol of sebacate, polyethylene glycol of succinate and Triton X-100 in such a way, that after removing free solvents the mass of films amounts to 7-10 micrograms, responses of piezo-electric quartz resonators with films are simultaneously recorded over 1-2 minutes and formed into kinetic "visual imprint", on basis of area of which using a calibrating graph the concentration of ethyl spirits is determined.

EFFECT: correctness, precision, selectivity, speed and convenience of analysis.

1 ex, 3 dwg