Abstract：The sample was dissolved with nitric acid (1+2) and hydrochloric acid (1+1). Most lead and silver were precipitated by hydrochloric acid. Then, the supernatant liquid in medium of 16 g/L citric acid-0.12 mol/L hydrochloric acid was directly analyzed by graphite furnace atomic absorption spectrometry to determine the content of aluminum in tin-lead solder. The results showed that the tin was not hydrolyzed without volatilization in selected acidity medium. Most lead and silver were precipitated on the bottom in form of chlorides. The supernatant liquid could be directly analyzed without filtration to remove silver and lead precipitations by degreasing cotton-paper pulp which was treated by hydrochloric acid. The clarification of sample solution could last for long time. The tin and coexisting elements in sample did not interfere with the determination. The linear range of method was 3.00-100.00 μg/L, and the detection limit was 4.04 μg/L. The proposed method was applied to the determination of aluminum in certified reference materials of tin-lead solder. The found results were consistent with the certified values or those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES) in GB/T10574.13-2003. The relative standard deviations (RSD) were between 6.2% and 8.9%.
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