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1 引 言二苯碳酰二肼 (ＤＰＣ)是测定铬 的灵敏试剂 ,也用于萃取催化光度法测定金属离子。但用偶合反应与动力学指示反应和显色反应相结合 ,建立偶合反应催化萃取光度法测定铊还未见报道。本文研究了在弱酸性条件下 ,利用Ｔｌ 置换出Ｃｕ ＥＤＴＡ中的Ｃｕ 与Ｃｕ 催
1 Introduction Diphenylcarbazide (DPC) is a sensitive reagent for the determination of chromium and is also used for the catalytic catalytic spectrophotometric determination of metal ions. However, it has not been reported that the coupled reaction catalyzed spectrophotometric method for the determination of thallium by coupling reaction with kinetic indicator reaction and chromogenic reaction. In this paper, Cu and Cu in Cu EDTA were replaced by Tl under mildly acidic conditions