2-乙基己醇萃取-原子吸收光谱法测定微量镓

Determination of Microamounts of Gallium by Flame Atomic Absorption Spectroscopy after Extraction with 2- Ethyl Hexanal

在 7.0 mol/L盐酸介质中 ,在抗坏血酸存在下 ,用 2 -乙基己醇萃取试样溶液中的酸性铬蓝 K-镓的络合物 ,然后用 30 g/L 的硫脲将络合物反萃取到水相中 ,用 FAAS法测定镓 ,据此建立了萃取反萃取 - FAAS法测定微量镓的新方法。方法线性范围为 0～ 60 .0 mg/L,灵敏度为 0 .2 8mg/L/1 %。

Based on extraction and back extraction FAAS, a method of determination of gallium was described. In 7.0 mol/L hydrochloric acid solution with presence of ascorbic acid, the of complex of acidic chrome blue K gallium was extracted from samples by 2 ethyl hexanol.The complex was then back extracted into aqueous phase by thiourea.The amount of gallium was determined by FAAS. The linear range of calibration curve is 0～60.0 mg/L. The sensitivity is 0.28 mg/L for an absorbance of 1%. The method was applied to determine microamounts of gallium in sodium aluminate solution with satisfactory results.