为控制车间空气氨的含量不超过国家最高容许浓度 ,需定期对车间空气进行监测。以往测定空气氨含量多采用纳氏试剂比色法 ［１］,但当空气中氨含量高时 ,用纳氏法会出现混浊或沉淀 ,需将样品稀释后再测定。本文介绍的酚—次氯酸盐比色法是在碱性介质中以酚、亚硝基铁氰化钠及次 To control the workshop air ammonia content does not exceed the national maximum allowable concentration, the need for regular monitoring of the workshop air. In the past the determination of air ammonia content using more Nessler reagent colorimetry [1], but when the ammonia content in the air is high, the use of Nathan’s method appears turbidity or precipitation, the sample to be diluted before measuring. This article describes the phenol - hypochlorite colorimetric method in alkaline medium phenol, nitroso, sodium cyanide and times