乙酸丁酯萃取-苯基荧光酮-溴化十六烷基三甲基铵光度法测定化探样及冶金物料中微量铟

Spectrophotometric determination o f micro amounts of indium in geological samples and metallurgical materials with phenylfluorone and cetyltrimethyl ammonium br omide after extraction of [InBr_4]^- with n-butyl acetate

在 5 0mol/LHBr介质中 ,铟以 [InBr4 ] - 形式被乙酸丁酯萃取 ,与大量共存元素分离 ,经 6 0mol/L盐酸反萃取后 ,于pH6 5的乙酸 -乙酸钠缓冲溶液中 ,In 与苯基荧光酮 (PF) ,溴化十六烷基三甲基铵 (CTMAB)形成稳定三元络合物 ,其最大吸收波长λmax=5 80nm ,ε=1 5 8× 10 5,线性范围 0～ 2 0 μg/2 5mL ,用于化探样品及其冶金物料中微量铟的测定 ,结果满意。

In a medium of HBr indium as - was extracted by n butyl acetate to separate a large amount of coexiting elements, and was back extracted by a solution of 6.0 mol/L HCl at pH6.0. In the buffer solution of HAc-NaAc at pH6.5 and in the presence of CTMAB , In *# forms a stable ternary complex with phenylfluorone and CTMAB. The maximum absorption of the ternary c omplex is at 580nm,and the apparent molar absorptivity is 1 58×10 5 Bee r's law is obeyed in the concentra tion range of 0-20μg/25mL for In*#