Abstract：The coloring reaction between 2-(5-iodine-2-pyridineazo)-5-dimethylaniline (5-I-PADMA) and palladium(Ⅱ) was investigated. The experimental results showed that, 5-I-PADMA could react with palladium(Ⅱ) to form blue stable complex with molar ratio of 1∶1 in 0.6 mol/L perchloric acid medium. The maximum absorption peak of this complex was at 613 nm. Beer’s law was obeyed for palladium(Ⅱ) concentration in the range of 0-0.6 μg/mL. Linear regression equation was △A=0.828 4 ρ(μg/mL)- 0.001 6 with correlation coefficient of 0.999 9 and apparent molar absorptivity of 8.82 × 104 L·mol-1·cm-1. The proposed method was applied to the determination of trace palladium in palladium molecular sieve and ore samples. The results were in accordance with those obtained by atomic absorption spectrometry, and the relative standard deviations(n=6)were 1.2%-1.4% .
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