FIELD: environmental hydrogen fluoride control. SUBSTANCE: sensor composition for determining hydrogen fluoride in air includes colorimetric reagent alizarin-lanthanum-complexonate, acetate buffer solution, glycerol, and water serving to provide optimum reaction conditions, and also a carrier and cellulose as binder with following component concentrations, wt.-%: alizarin-complexon, 0.003-0.019; lanthanum nitrate, 0.0072; buffer solution (pH 4.5), 0.6-0.8; glycerol, 44; water, 1-3; cellulose, the balance. EFFECT: improved accuracy of determination.
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