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研究了在聚乙二醇 -硫酸铵 -亚硝基R盐体系中萃取光度法测定钯。在 pH 1 .3的NaAc-HCl缓冲溶液中 ,钯与亚硝基R盐形成橙色配合物 ,被萃取到高聚物相 ,其配合物的最大吸收波长位于 50 0nm处 ,摩尔吸光系数为 1 .58× 1 0 4L·mol- 1.cm- 1,Pd(Ⅱ )与亚硝基R盐的配位比为 1∶3,Pd(Ⅱ )的质量浓度在 0～ 2 .2mg/L内符合比尔定律。方法用于碳 -钯催化剂中钯的测定 ,6次测定的RSD为 2 .7%。
The extraction spectrophotometric method for the determination of palladium in polyethylene glycol - ammonium sulfate - nitroso R salt system was studied. In pH 1.3 NaAc-HCl buffer solution, palladium and nitroso R salt form an orange complex and are extracted into the polymer phase. The maximum absorption wavelength of the complex is at 50 0 nm and the molar extinction coefficient is 1 .58 × 10 4 L · mol -1 cm -1, the coordination ratio of Pd (Ⅱ) to nitroso R salt was 1: 3, the concentration of Pd (Ⅱ) was within 0-2.2 mg / L In line with Bill’s law. The method was applied to the determination of palladium in carbon-palladium catalyst. The RSD of 6 determinations was 2.7%.