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 %。已用于铝酸钠溶液中微量镓的测定 In 7.0 mol / L hydrochloric acid medium, the complex of chrome blue K-gallium in the sample solution was extracted with 2-ethylhexanol in the presence of ascorbic acid and then complexed with 30 g / L of thiourea The material was extracted back into the aqueous phase, and the gallium was determined by FAAS method. A new method was developed for the determination of trace gallium by FAAS. The linear range of the method was 0-60.0 mg / L with a sensitivity of 0.28 mg / L / 1%. Has been used for the determination of trace amounts of gallium in sodium aluminate solution