METHOD OF DETECTING EXPLOSIVES IN THE AIR Russian patent published in 2018 - IPC G01N33/22 G01N21/76 

FIELD: blasting operations; measurement technology.

SUBSTANCE: invention relates to the detection of microconcentrations of substances in a gaseous medium, in particular to the detection of molecules of explosives (nitro compounds) in the air. Method is characterized in that sorption of the explosive molecules of the test air sample is carried out on an auxiliary element, followed by desorption and thermal decomposition of the explosive molecules in the gas phase at the temperature of 250–450 °C, then the air flow with products of thermal decomposition of the explosive molecules is fed into the detection zone, further, by interaction with a chemical reagent, the maximum intensity of chemiluminescence is caused and recorded, the content of the products of the thermal decomposition of the explosive molecules in the sample is determined from it, analytical signal (U1) is determined and, basing on the results of the comparison with threshold analytical signal (U2), the content of explosives in the air sample is estimated, herewith the air sample to be examined is first supplied without the products of thermal decomposition of the explosive into the detection zone, then by interaction with a chemical reagent containing a solution of luminol caused is chemiluminescence and the maximum intensity of the chemiluminescence is recorded with a photoreceiver, the content of nitrogen dioxide in the sample without products of thermal decomposition of the explosive is determined from it, as per which the value of threshold analytical signal (U2) is determined.

EFFECT: increase in sensitivity and error immunity is provided when an explosive is detected in the air.

5 cl, 3 dwg, 1 ex