Abstract：The sample was dissolved with nitric acid, hydrofluoric acid and sulfuric acid. Most interference ions were precipitated by strong alkali separation. The interference ions of Al3+, Mn2+, Ti4+, V(V), Cl- and F- were masked by 2.0 mL of 150 g/L ascorbic acid solution and 1.0 mL of 10 g/L oxalic acid solution. In 0.9 mol/L sulfuric acid medium, the tin ions could react with phenylfluorone and cetyl trimethyl ammonium bromide (CTMAB) to form ternary complexes, which had maximum absorbance at 536 nm. Based on this, the spectrophotometric determination of tin was realized. Beer's law was obeyed for tin in range of 0.1-1.0 μg/mL. The linear correlation coefficient was 0.999 8. The low limit of determination of method was 0.030%. The content of tin in ferrotitanium sample was determined, and the found results were consistent with those obtained by ICP-AES. The relative standard deviation (RSD, n=8) was less than 3.0%.
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