5-(对羧基苯偶氮)-8-羟基喹啉与钍的显色反应及应用  

ON COLOR REACTION OF 5-(4-CARBOXYL-PHENYLA20)-8-HYDROXYQUINOLEIN WITH THORIUM AND ITS APPLICATION

作　　者：李永忠[1] 陈泽堂[1] 周之荣[1] 于涛[1] 汪庆华[1] 

机构地区：[1]东华理工学院应用化学系,江西抚州344000

出　　处：《南昌大学学报（理科版）》2004年第1期92-95,共4页Journal of Nanchang University(Natural Science)

摘　　要：研究了钍与5-(对羧基苯偶氮)-8-羟基喹啉(5-CPAHQ)的显色反应条件:在阳离子表面活性剂十六烷基三甲基溴化铵(CTMAB)存在下,pH4.4-5.4缓冲介质中,形成稳定的橙红色络合物,最大吸收波长为490nm,ε=1.10×105L·mol-1·cm-1,钍在0-9μg/25mL范围内符合比尔定律。用TBP萃淋树脂分离,该方法可用于测定矿石中的微量钍。The Color reaction of thorium with 5-(4-Carboxyl-phenyla20)-8-hydroxyquinolein was studied. It has been proved that the Color-complex of thorium with 5-(4-Carboxyl-phenyla20)-8-hydroxyquinolein is formed with maximum absorption at 490nm. The apprant molor absorptivity is 1.10×10~5 L·mol^(-1)·cm^(-1) at pH4.4-5.4.The beer's law is obeyed in the range of 0-9μg Thorium per 25 mL.The molor ratio of thorium to 5-(4-Carboxyl-phenyla20)-8-hydroxyquinolein is 1∶6. After separation by TBP levextrd resin, the method can be used to determine trace Thorium in the rock minered and good results have been obtained. -

关 键 词：5-(对羧基苯偶氮)-8-羟基喹啉 钍 显色反应 分光光度法 络合物 比尔定律 

分 类 号：O614.42[理学—无机化学] O657.31[理学—化学]