5-(对羧基苯偶氮)-8-羟基喹哪啶分光光度法测定痕量金  

Spectrophotometric determination of trace gold with 5-(p-carboxylphenylazo)-8-hydroxylquinaldine

作　　者：张秋荣[1] 张海芹[1] 陈文宾[1] 

机构地区：[1]淮海工学院化学工程学院,江苏连云港222005

出　　处：《冶金分析》2011年第1期70-73,共4页Metallurgical Analysis

基　　金：2010年江苏省海洋资源开发研究院科技开放基金项目(JSIMR10E01);淮海工学院大学生创新项目

摘　　要：研究了在CTMAB微乳溶液存在下,5-(对羧基苯偶氮)-8-羟基喹哪啶(5-CPAHQD)与Au(Ⅲ)发生显色反应的条件,建立了新的测定痕量Au(Ⅲ)的分光光度法。实验结果表明,在醋酸-醋酸钠介质中,5-(对羧基苯偶氮)-8-羟基喹哪啶与Au(Ⅲ)发生灵敏的显色反应,生成络合比为2∶1的红色络合物,其最大吸收峰位于530nm,表观摩尔吸光系数为3.0×105 L.mol-1.cm-1。在10mL溶液中,Au(Ⅲ)量在0.004～7.2μg之间符合比尔定律,检出限为0.12μg/L,并且该显色反应具有较强的抗干扰能力,可用于金矿样品中痕量Au(Ⅲ)的测定,结果与原子吸收光谱法相一致,相对标准偏差(n=6)为3.4%和4.2%。The coloring conditions between 5-（p-carboxylphenylazo）-8-hydroxylquinaldine（5-CPAHQD） and Au（Ⅲ） in the presence of CTMAB micro emulsion were studied to establish a new spectrophotometric determination method of trace gold.The results showed that 5-CPAHQD had a sensitive coloring reaction with Au（Ⅲ） in HAc-NaAc medium.A red complex（2∶1） was formed with maximum absorption peak at 530 nm.The apparent molar absorptivity was 3.0×10^5 L·mol^-1·cm^-1.Beer＇s law was obeyed for Au（Ⅲ）in the range of 0.004-7.2 μg in 10 mL of solution,and the detection limit was 0.12 μg/L.This coloring reaction showed good interference resistance.The proposed method was applied to the determination of trace Au（Ⅲ） in gold ore samples,and the results were consistent with those obtained by atomic absorption spectrometry.The relative standard deviation（RSD,n=6） was 3.4% and 4.2%.

关 键 词：5-(对羧基苯偶氮)-8-羟基喹哪啶 分光光度法 金(Ⅲ) 

分 类 号：O657.32[理学—分析化学]