METHOD OF EXPRESS-DETECTION OF AGGRESSIVE CHEMICAL SUBSTANCES Russian patent published in 2015 - IPC G01N31/22 

FIELD: chemistry.

SUBSTANCE: method consists in spraying an indicator formulation from a distance of 10-15 centimetres from an object surface with the application of an aerosol device, made in the form of a hermetic case, filled with the indicator formulation, and a pump-sprayer, a conclusion about the presence of an aggressive chemical substance is made by the characteristic change of the indicator colour on the surface of the analysed object in accordance with the standard on the aerosol device label. Spraying of the indicator formulation is realised by a mono-disperse aerosol, to detect oxidants applied is a solution in weight percents: potassium iodide - 0.1-0.4; starch, preliminarily processed by heating to a temperature of 190°C in glycerin for 0.5 hour with periodical collecting a sample for dissolution in cold water until starch precipitation stops - 0.1-0.3; glycerin - 5-20; acetic acid - 0.3-1.5; sodium trihydrate acetate - 0.4-3; distilled water - to 100, to detect substances of an alkaline type a 0.5-1 wt % solution of phenolphthalein in ethyl alcohol is applied, to detect substances of an acidic type a 0.05-0.1 wt % solution of each individually or a mixture of two indicators methyl red and methyl yellow in a volume ratio of 1:1 in ethyl alcohol, to detect weak organic acids of an acetic acid type a 0.05-0.1 wt % solution of 4-diethylaminoasobenzol in ethyl alcohol is applied, to detect asymmetric dimethylhydrazine (heptyl) and ammonia a 10-20 wt % solution of cobalt (II) acetate in distilled water is applied.

EFFECT: increase of sensitivity, self-descriptiveness and reliability of detection.

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