FIELD: chemistry.
SUBSTANCE: parametric array of an "electronic nose"-type mutichannel gas analyser is formed using 3 piezoelectric sensors with natural frequency of 10 MHz, whose electrodes are modified, for which their surfaces are uniformly coated with sorbents in form of a film of separate acetone solutions of acid-base bromocresol blue (BCB), bromothiomol blue (BTB), bromophenol blue (BPB) with weight of 10-15 mcg, followed by drying at temperature 40°C for 15 minutes in order to remove the solvent and then putting into the housing of a static "electronic nose"-type mutichannel gas analyser and holding therein for 5 minutes in order to establish a stable zero signal; a sample of solid substance is then collected with weight of 2 g or a liquid with volume of 3 ml and then put into a 10 cm3 weighing bottle with a polyurethane membrane at the top, heated to temperature 20±2°C, held in the weighing bottle for 10 minutes in order to saturate the gas phase with vapour of the analysed sample; 3 cm3 of the equilibrium gas phase is then collected through the polyurethane membrane using a syringe and then injected into the housing of the static "electronic nose"-type mutichannel gas analyser; oscillation frequency of the piezoelectric sensors is then measured for three minutes; an integral algorithm is then used to determine the resultant analytical signal in form of a kinematic " visual print" of responses of the piezoelectric sensors 5 s and 180 s after injecting sample vapour into the housing of the static "electronic nose"-type mutichannel gas analyser; presence of amines of different structure is determined from the form of the kinematic "visual prints" which are compared with standards obtained for pure amines of the same structure; reclamation of the piezoelectric sensors and the housing of the static "electronic nose"-type mutichannel gas analyser is carried out using dry laboratory air which is fed into the housing using a compressor for 120 s.
EFFECT: faster and simpler analysis while preserving accuracy, reproducibility of measurement and reliability of determining even small amounts of amines.
2 ex, 1 tbl, 2 dwg
