INDICATOR PLATE AND METHOD OF DETERMINING HIGH CONCENTRATIONS OF CHEMICALLY HAZARDOUS SUBSTANCES IN AIR Russian patent published in 2013 - IPC G01N31/22 G01N21/78 

FIELD: chemistry.

SUBSTANCE: groups of inventions is meant for rapid determination of high concentrations of hydrogen chloride, ammonia, chlorine and nitrogen dioxide in air, which are chemically hazardous substances, and can be used to monitor atmospheric contamination during industrial disasters associated with emission of chemically hazardous substances into the environment. The indicator plate consists of organic glass, indicator paper attached to the organic glass and insulated from the atmosphere by an adhesive tape, a cardboard strip and two guide marks on the organic glass. The adhesive tape has an incision to mark the tearing point of the cardboard strip. The group of inventions also relates to a method of determining high concentrations of chemically hazardous substances in air using said indicator plate, involving: opening the bottom part of the indicator plate by tearing the cardboard strip; recording the time of tearing the cardboard strip; monitoring colouring reaction of the indicator paper upon reaction with chemically hazardous substances and progression of the coloured layer upwards; determining concentration of the substance from the height of progression of the front of the dye relative the first or second guide mark.

EFFECT: simple and fast determination of high concentrations of chemically hazardous substances in air.

8 cl, 1 dwg