【摘要】 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0.1~20μg/mL,加入10~20 mL HCl、3 mLHNO3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0.006μg/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。更多还原

【Abstract】 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 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 0.00 6 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.更多还原