3-噻唑偶氮-5-氨基苯酚分光光度法测定铝矿石中稀土总量  

Spectrophotometric determination of total rare earths in aluminum ore with 3-thiazolylazo-5-amino phenol

作　　者：杜芳艳[1] 

机构地区：[1]榆林学院化学与化学工程学院,陕西榆林719000

出　　处：《冶金分析》2007年第1期64-66,共3页Metallurgical Analysis

摘　　要：研究了3-噻唑偶氮-5-氨基苯酚（TAAP）与稀土（REs）的显色反应，建立了分光光度法测定铝矿石中稀土总量的新方法。在pH 7．0的Tris—HCl缓冲溶液中，REs与TAAP生成组成比为1：3的稳定红色络合物，其最大吸收波长位于523nm处，REs总量在0．07～1．5μg／mL范围内符合比尔定律。方法已用于铝矿石样品中稀土总量的测定，测定结果与电感耦合等离子原子发射光谱法一致，标准加入回收率为97．4％～106．1％，相对标准偏差不超过2．5％。The color reaction of rare earths with 3-thiazolylazo-5-amino phenol （abbreviated TAAP） was studled,and a new spectrophotometric determination of total REs in aluminum ore with TAAP was estab- lished. In the Tris - HCl buffer solution at pH 7.0, REs can react with TAAP to form a stable 1 ： 3 red complex,which maximum absorption wavelength is located at 523 nm. Beer＇s law is obeyed in the range of 0.07 -1.5/μg/mL. The method has been applied to the determination of total REs in aluminum ore samples,and the results were consistent with the values obtained by ICP-AES. The addition recoveries are between 97.4 % and 106.1%, and the RSD no more than 2.5 %.

关 键 词：分光光度法 3-噻唑偶氮-5-氨基苯酚(TAAP) 稀土总量 铝矿石 

分 类 号：P575[天文地球—矿物学] O657.3[天文地球—地质学]