聚乙二醇-硫酸铵-二溴羧基偶氮氯膦体系萃取分光光度法测定微量钯  

Study on Spectrophotometric Determination of Micro Amount of Palladium after Solvent Extraction with Polyethylene Glycol-Ammonium Sulfate-DBOK-CPA

作　　者：王克太[1] 张彪[1] 柴凤英[1] 陈兴国[2] 胡之德[2] 

机构地区：[1]甘肃联合大学化学系,甘肃兰州730000 [2]兰州大学化学化工化学院,甘肃兰州730000

出　　处：《岩矿测试》2006年第1期39-41,共3页Rock and Mineral Analysis

基　　金：甘肃联合大学科研基金资助项目(0111-05)

摘　　要：研究了聚乙二醇-2000水溶液在硫酸铵存在下分为液-液两相的条件和二溴羧基偶氮氯膦与Pd（Ⅱ）反应生成的配合物在该萃取体系两相间的分配行为，实现了Pd（Ⅱ）的定量萃取分离。在此基础上建立了非有机溶剂液-液萃取分光光度法测定微量Pd（Ⅱ）的新方法。该方法的检出限为0．03mg／L，线性范围为0．09～2．0mg／L，在最佳实验条件下，萃取率达94％。方法用于铂钯二次精矿和人工合成样品中微量钯的测定，相对标准偏差（RSD，n=5）≤2．4％，加标回收率为96％-103％。In this paper, a new method for the determination of micro amount of palladium by after solvent extraction with polyethylene glycol-ammonium sulfate-DBOK-CPA was developed spectrophotometry . The distribution behaviors of the complex of Pd（ Ⅱ）-DBOK-CPA between two phases in PEG-2000-（ NH4 ）2SO4-H2O extraction system were investigated. Under the optimized conditions, the extraction rate of Pd was 94%. The linear range of the method was 0.09 - 2.0 mg/L with detection limit of 0.03 mg/L for Pd. The method has been applied to the determination of micro amount of palladium in Pt-Pd refined ores and artificial samples with precision of ≤2.4% RSD and recoveries of 96% - 103% （n =5）.

关 键 词：分光光度法 钯 萃取 非有机溶剂 二溴羧基偶氮氯膦 

分 类 号：O657.32[理学—分析化学] O614.823[理学—化学]