聚乙二醇——硫酸铵——对硝基偶氮氯膦体系萃取分光光度法测定微量钯的研究

Extraction Separation Determination of Pd (Ⅱ) With PEG－2000－(NH_4)_2SO_4－CPA－PN System

本文研究了PEG-2000水溶液在硫酸铵存在下，分成液-液两相的条件和偶氮氯膦-PN及Pd(Ⅱ)配合物在该体系两相间的分配行为，实现了Pd(Ⅱ)的定量萃取分离．在此基础上建立了Pd(Ⅱ)-CPA-PN-PEG-2000非有机溶剂液-液萃取分光光度法测定微量钯的新方法．

The agueous solution of PEG-2000 can be separated into two liguid phases in the presence of (NH4)2SO4．The conditions of phase separation were found．The distribution behaviour of CPA-PN and Pd(Ⅱ)－CPA－PN－PEG－2000 Choicelate between the two phases were investigeted．The quantitative extraction separation of pd(Ⅱ) was carried out．A new trace microanalysis method were deueloped for determination of pd(Ⅱ) based on the reaction of pd(Ⅱ) with CPA－PN in the presence of PEG－2000．Use this method to sample analysis, We received satisfied result．