FIELD: measurement technology. SUBSTANCE: invention is intended to test concentration of ammonia in air of production areas or in atmosphere of populated areas. Method consists in keeping of reagent - crystalline hydrate of iron nitrite up to constant mass above solution of nitric acid of 55.0-65.0 per cent by mass concentration in advance. Analyzed air is passed over reagent for not longer than 85.0 h with transformation of ammonia into aerosol followed by registration of aerosol. EFFECT: enhanced authenticity of method. 3 tbl
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