5-(5-溴-2-吡啶偶氮)-2,4-二氨基甲苯催化光度法测定钯

Catalytic Spectrophotometric Determination of Trace Palladium(Ⅱ) with 5-(5-Bromo-2-pyridylazo)-2,4-diaminotoluene

在H2SO4介质和室温条件下,微量钯(Ⅱ)对KBrO3氧化5-(5-溴-2-吡啶偶氮)-2,4-二氨基甲苯(5-Br-PA-DAT)褪色反应具有显著的催化作用,据此建立了测定微量钯的催化光度法.方法的检测限为0.034mg/L,线性范围0.2～0.75mg/L.已用于钯碳催化剂及水样中钯含量的测定,标准加入回收率为97.2%～99.0%,结果满意.

In H2SO4 medium, a new catalytic spectrophotometric method for the determination of trace amount of palladium （Ⅱ） was established with 5-（5-bromo-2-pyridylazo） -2, 4-diaminotoluene（ 5-Br-PADAT） at room temperature, based on the catalytic effect of palladium（ Ⅱ ） on the oxidation reaction of 5-Br-PADAT by KBrO3. The detection limit is 0.034 mg/L, the linear range of the determination is 0.2 - 0.75 mg/L. The method has been successfully applied to the determination of palladium in catalyst and tap water with the recovery over 97.2 % - 99.0 %, and the results were satisfactory.