表面活性剂增敏催化动力学光度法测定痕量钯

Catalytic kinetic spectrophotometric determination of trace palladium with sensitization effect of surfactant

基于非离子表面活性剂Tween-20存在下,痕量Pd(Ⅱ)能灵敏地催化K2S2O8氧化靛红的褪色反应,据此建立了测定Pd(Ⅱ)的催化动力学光度新方法。方法的线性范围为8×10-4~1.28×10-2μg/mL,检出限为5.3×10-9g/L,催化反应表观活化能为53.92 kJ/mol。方法已用于矿样中痕量钯的测定。

Based on the catalytic effect of the trace palladium(Ⅱ) on the oxidation reaction of indigo carmine by K2S2O8 in the tween-20 medium,a new catalytic kinetic spectrophotometric method has been developed for the determination of palladium(Ⅱ).The linear range of determination is 8×10-4～1.28×10-2 μg/mL and the detection limit is 5.3×10-9 g/L.The apparent activation energy is 53.92 kJ/mol.The method has been used for the determination of palladium in mineral samples with satisfactory results.