摘要
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%。
In polyethylene glycol (PEG) ammonium sulfate nitriso R salt system, the spectrophotometric determination of palladium was studied. Palladium reacts with nitroso R salt in HCl NaAc buffer solution at pH 1.3 and forms a orange complex with a molar ratio of 1∶3. The complex was extracted by PEG phase from water solution. The maximum absorption of the complex is at 500 nm with molar absorptivity of 1.58×10 4 L·mol -1 ·cm -1 . Beer's law is obeyed in the range of 0～2.2 mg/L of Pd (Ⅱ). The method has been applied to the determination of palladium in carbon palladium catalyst with precision of 2.7% RSD ( n =6).
出处
《岩矿测试》
CAS
CSCD
北大核心
2000年第3期238-240,共3页
Rock and Mineral Analysis
关键词
聚乙二醇
萃取光度法
钯
高聚物
polyethylene glycol (PEG)
extraction spectrophotometry
palladium
