FIELD: chemistry.SUBSTANCE: method of making an indicator strip for automatic strip-type gas analysers involves preparation of a base and treatment thereof with an impregnating solution. The base used is ribbed cotton fabric which is presoaked in 0.5-5% aqueous solution of a laundry detergent for 15-20 hours at temperature of 35-60°C, pressed on a centrifuge and immersed in a cooking liquor containing 2.0-5.0 g/l sodium silicate, 0.5-3.0 g/l sodium hydroxide and 0.2-0.7 g/l SMS, and then held in the cooking liquor at boiling point for 2-3 hours. The cooking liquor is then cooled to temperature of 40-60°C and hydrogen peroxide is then added until initial concentration of 0.5-1.5% is achieved. The base is held in the obtained solution for 3-5 hours at boiling point and washed in distilled water at temperature of 15-25°C. The base is then pressed on a centrifuge, dried at temperature of 20-25°C to residual moisture of content of 0.5-2.0%. The base is treated with 40-100 g/l of an aqueous impregnating solution of colloidal sodium silicate at pH 6.0-11.5 and dried at temperature of 65-95°C until achieving increase in weight of the base of 0.1-1.0%.EFFECT: high sensitivity of determining vapour of toxic organophosphorus substances.3 ex

Berezhnaya Margarita I

Papers

Method of manufacturing test tape for analyzing ammonia vapours