REACTIVE INDICATING STRIP FOR DETERMINATION OF NITRATE IONS (RIP-NITRATE-TEST) Russian patent published in 1994 - IPC

FIELD: analysis of nitrate ions in drinkable water. SUBSTANCE: arranged between layer with acid reagent and layer of organic indicating reagent of Griss test is layer consisting of zinc dust with adhesive filler. Layer with acid reagent contains secondary amine as masking agent for nitrate ions. Arranged under indicating layer is polymeric substrate-holder with hole. Zinc dust is found in opening of adhesive layer equidistant to opening in polymeric substrate. Used as secondary amine is diphenylamide, N-phenyl-1-naphthylamine, 3-hydroxy-1,2,3,4-tetrahydroquinone secured to modified chromatographic paper containing polyamide(amine) epichlorohydrin resin, expoxidized cellulose. EFFECT: higher efficiency. 4 cl, 1 dwg, 1 tbl