铬(Ⅲ)的分光光度测定法近年来报道不少,如二甲酚橙法、铬青R法、PAA法,这些方法虽灵敏度较高,但选择性较差,最近报导的间甲基偶氮羧法可在室温显色,克服了沸水加热的缺点,但温度要求苛刻,难于应用.对乙酰基偶氮胂与稀土、钍、钪等元素的显色反应研究已有报导,但与铬(Ⅲ)的显色反应尚未见报导.本文研究了对乙酰基偶氮胂与铬(Ⅲ)的显色反应的条件.试验表明,该试剂也是测定铬(Ⅲ)的灵敏试剂,其表观摩尔吸光系数为4.55×10~4,络合物组成为1:2,显色反应 Spectrophotometric determination of chromium (III) has been reported in recent years, such as xylenol orange method, chromium cyanine R method, PAA method, although these methods have higher sensitivity, but less selective, the recently reported meta methyl couple Nitrogen carboxylation method can be developed at room temperature, overcome the shortcomings of boiling water heating, but the temperature is harsh, difficult to apply.Peronyl arsenazo and rare earth, thorium, scandium and other elements of color reaction has been reported, but with chromium (Ⅲ) chromogenic reaction has not been reported.In this paper, the conditions for the color reaction of acetylarsenazo arsenic with chromium (Ⅲ) were studied.The experiments show that the reagent is also a sensitive reagent for the determination of chromium (Ⅲ) The extinction coefficient is 4.55 × 10 ~ 4, the complex composition is 1: 2, the color reaction