本文报道了用分光光度法测定离子交换工艺过程中微量铵的方法。方法基于在碱性介质中用次氯酸钠(安替福民)氧化铵苯酚,使之形成蓝色靛酚化合物,其最大吸收峰位于600nn处。在EDTA存在下,较大量钙、镁、铝、铁等不干扰测定。方法操作简便、快速。 This paper reports the spectrophotometric method for the determination of trace ammonium in ion exchange processes. The process is based on the oxidation of ammonium phenol with sodium hypochlorite (aphrodite) in alkaline medium to form a blue indophenol compound with a maximum absorption peak at 600 nn. In the presence of EDTA, larger amounts of calcium, magnesium, aluminum, iron, etc. do not interfere with the assay. The method is easy to operate and fast.