5-Br-PADAP分光光度法测定环境水样中微量钍  

Spectrophotometric determination of micro thorium in environmental water with 5-Br-PADAP

作　　者：朱理哲[1] 黄美新[1] 

机构地区：[1]湘潭工学院资源工程系,湖南湘潭411201

出　　处：《冶金分析》2002年第2期17-18,8,共3页Metallurgical Analysis

摘　　要：研究了钍 与 5 Br PADAP的显色反应。在 pH4 5的HAc NaAc介质中 ,有OP存在下 ,钍 与 5 Br PADAP生成红色络合物 ,其最大吸收波长为 5 90nm ,表观摩尔吸光系数为 1 2 7× 10 5。含钍 0～ 10 μg/2 5mL符合比尔定律。方法灵敏度高、快速简便 ,采用TBP萃取可以除去大部分干扰离子。方法用于环境水样中微量钍的测定 ,钍的标准加入回收率在98 0 %～ 10 0 3 %之间 。The color reaction of thorium*$with 5 [(5 bromo 2 pyridyl) azo] 5 diethylaminophenol(5 Br PADAP)was investigated In the presence of OP,a red complex is formed in the buffer solution of HAc NaAc(pH4 5) The complex has a maximum absorption at wavelength of 590nm The apparent molar absorptivity is 1 27×10 5L·mol -1 ·cm -1 Beer's law is obeyed in the range of 0-10μg/25mL for thorium This method possesses the advantage of high sensitivity,simplicity and rapidity Most of the interfering ions can be eliminated by the extraction with tributyl phosphate The proposed method is applied to the determination of trace thorium in environmental water with satisfactory results

关 键 词：5-BR-PADAP 分光光度法 环境水样 微量 钍 

分 类 号：O657.32[理学—分析化学]