铬(Ⅵ)的分光光度法测定多用二苯碳酰二肼法,而铬(Ⅲ)的显色反应报导较少。塔塔也夫曾用偶氮胂衍生物作铬(Ⅲ)的显色剂,对偶氮胂Ⅰ的反应未作详细研究。我们发现在加热煮沸时,铬(Ⅲ)的水合能力减弱,在pH3时铬(Ⅲ)可与偶氮胂Ⅰ发生显色反应。络合物一经形成,再用6N盐酸酸化,铬(Ⅲ)络合物仍保持稳定,而许多离子与试剂形成 Chromium (Ⅵ) spectrophotometric determination of the use of diphenylcarbazide method, and chromium (Ⅲ) color reaction less reported. Tata Yeff had used arsenazo derivatives as chromogenic agents for arsenazo I, the reaction has not been studied in detail. We found that the hydration capacity of chromium (Ⅲ) decreased when heated and boiled, and chromium (Ⅲ) reacted with arsenazo Ⅰ at pH3. Upon formation of the complex and further acidification with 6N hydrochloric acid, the chromium (III) complex remains stable with many ions forming with the reagent