Abstract:Based on the fluorescent complex between Ga(Ⅲ) and the reagent of 7-(8-hydroxy quinoline-5-sulfoacid azo)-1,8-dihydroxy-3,6-naphthalene disulfoacid(8Q5SAC),which was formed in 1:1type and 1:3type at pH4.2,a new fluorescence method for determinaion of Ga(