Abstract: HG-AFS was applied to the determination of tin in antimony concentrates.Influential factors,including the concentration and kinds of acid medium,amount of potassium borohydride added,and interferences of Sb(Ⅴ) and other coexisting ions,were studied and optimized.Linear relationship between the values of fluorescence intensity and mass concentration of Sn found was within the range of 160 μg·L-1,with detection limit (3s/k) of 0.50 μg·L-1.The proposed method was applied to the analysis of two antimony concentrate samples.Using these samples as matrixes,tests for recovery and precision were made by standard addition method,values of recovery found were in the range of 92%-95% and 92%-96%,and RSD′s (n=6) were 0.83% and 7.2%.