FIELD: chemistry.
SUBSTANCE: invention relates to organic compounds containing in their composition simultaneously acidic and basic groups, having common name – complexons, and can be used in analytical chemistry for making chemical indicators on solid-phase media, in particular for express control of content of nitrates in plant growing products, water, food products and waste water of various origin. Composition of the maskirant-acid layer of indicator paper for determination of nitrate ions includes D-N-(carboxymethyl)aspartic acid and 3-hydroxy-1,2,3,4-tetrahydrobenzoquinoline, wherein their ratio is 8:1 pts.wt.
EFFECT: invention provides higher efficiency of using the main component when creating indicator paper for determining nitrates.
1 cl, 4 ex
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