2-(2-喹啉偶氮)-5-二甲氨基苯甲酸光度法测定钯的研究  

Spectrophotometric Determination of Palladium with 2-(2-Quinolinylazo)-5-Diaminobenzoic Acid

作　　者：胡秋芬[1] 朱利亚[1] 陈景[1] 杨光宇[1] 尹家元[1] 

机构地区：[1]云南大学化学系

出　　处：《岩矿测试》2004年第2期117-120,共4页Rock and Mineral Analysis

基　　金：云南省教育厅科研基金(0211143);玉溪师范学院科研基金(020024)

摘　　要：研究了2-(2-喹啉偶氮)-5-二甲氨基苯甲酸(QADMAB)与钯的显色反应,在溴化十六烷基三甲胺存在下,pH4.0的HAc-NaAc缓冲介质中,QADMAB与钯反应生成组成为2∶1,λmax=630nm,ε=1.03×105L·mol-1·cm-1的配合物。钯含量在0.01～1.20mg/L内符合比尔定律。该方法已用于一些含钯样品中钯含量的测定,结果与原子吸收法测定结果相符,5次平行测定的RSD<5%。2-(2-quinolinylazo)-5-diaminobenzoic acid (QADMAB) is synthesized and its color reaction with palladium(Ⅱ) is studied. In the presence of HAc-NaAc buffer solution (pH=4.0) and in CTMAB medium, QADMAB reacts with palladium(Ⅱ) to form a stable 2∶1 complex. The molar absorptivity of the complex is (1.03)×10^(5 ) L·mol^(-1)·cm^(-1) at 630 nm. Beer′s law is obeyed in a range of 0.01～1.20 mg/L for palladium.The method has been applied to the determination of palladium(Ⅱ) in real samples. The results are in agreement with those determined by AAS with precision of less than 5% RSD(n=5).

关 键 词：钯 分光光度法 2-(2-喹啉偶氮)-5-二甲氨基苯甲酸 显色反应 

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