火焰原子吸收光谱法测定锡基合金中痕量银

采用HCl和HNO3溶解样品，建立了火焰原子吸收光谱法测定锡基合金中银的方法。考察了不同的盐酸、硝酸用量对Ag+回收率的影响，试验结果表明：当溶液中Ag+浓度在0.1～20 μg/mL，加入10～20 mL HCl、3 mL HNO3时，Ag+与Cl-络合得最完全，生成［AgCl4］3-,回收率在98.6%～107.1%之间，实验选择加入10 mL HCl和3 mL HNO3溶解样品。样品中的铜离子及其它痕量离子不干扰测定，方法检出限为0.006 μg/mL。对3个锡基合金样品进行测定，相对标准偏差在0.29%～0.31%之间；本法与ICP-AES法的测定值进行对照，结果相一致。

Determination of trace silver in tin-based alloys by flame atomic absorption spectrometry

With sample dissolved by HCl and HNO3, a determination method of silver in tin-based alloy by flame atomic absorption spectrometry was established. The effect of HCl and HNO3 dosages on the recovery rate of Ag+ was investigated. The results showed that, when the concentration of Ag+ in solution was 0.1-20 μg/mL and 10-20 mL of HCl and 3 mL of HNO3 were added, Ag+ and Cl- complexed most completely, which formed ［AgCl4］3-. The recoveries were 98.6%-107.1%. In this study, the sample was dissolved with 10 mL of HCl and 3 mL of HNO3. The copper ion and other trace ions had no interference with the determination. The detection limit of method was 0.006 μg/mL. Three tin-based alloy samples were determined, and the relative standard deviations (RSD) were 0.29%-0.31%. The determination results of this method were compared with those obtained by ICP-AES and the values were consistent.