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用络合滴定法结合分光光度法对络合滴定中常用金属离子指示剂铬黑Ｔ的配制方法进行了改进，提高了铬黑Ｔ溶液的稳定性，有效期可达２个月．
The method of complexing titration and spectrophotometry is used to improve the preparation method of chrome black T which is commonly used as metal ion indicator in complexometric titration. The stability of chrome black T solution is improved and the expiration date is up to 2 months.