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研究在酸性介质中钯(Ⅱ)阻抑试剂DAoVMPM与V(V)显色反应的动力学参数,反应的表观速率常数K0=2.285×10-2min-1,表观活化能Ea=67.51kJ/mol。基于这种阻抑作用建立了一种测定钯的动力学光度分析法,Pd(Ⅱ)含量在0.5μg/25mL~10.0μg/25mL能被准确检出,检出限为5.0×10-9g/mL。该方法灵敏度高,稳定性好,用于石钯渣和钯催化剂中钯的测定,本法的相对标准差RSD为1.0‰~1.5‰,回收率为96%~103%。
The kinetic parameters of the color reaction of DAoVMPM with V (V) were investigated in acidic medium. The apparent rate constant K0 = 2.285 × 10-2min-1 and the apparent activation energy Ea = 67.51 kJ / mol. Based on this inhibition, a kinetic spectrophotometric method for the determination of palladium was established. The content of Pd (Ⅱ) can be accurately detected in the range of 0.5μg / 25mL ~ 10.0μg / 25mL with the detection limit of 5.0 × 10-9 g / mL. The method has high sensitivity and good stability, and is used for the determination of palladium in stone-palladium slag and palladium catalyst. The relative standard deviation RSD of this method is 1.0 ‰ ~ 1.5 ‰ and the recovery rate is 96% -103%.