Hygienic Chemical Studies on Public Nuisance by Injurious Gases. XIII. : Studies on the Method for Determination of Ammonia in Air

Abstract

The method for the determination of micro (0.5-5 ppm of NH₃) and macro (500-5000 ppm of NH₃) amounts of ammonia in air were studied. For the purpose of micro analysis of ammonia in air, the indophenol method, in which sodium nitroprusside was added as a catalyzer of indophenol formation, was more excellent in the sensitivity, reproducibility and stability of color than the other methods for micro analysis. For the purpose of macro analysis of ammonia in air, the cupric carbonate method was relatively simple and reliable. Furthermore, 0.5% boric acid solution was adopted as an absorption medium of ammonia in air.