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已有的测定铅及其合金中微量锡的分光光度法和火焰原子吸收法对测定锡含量低于0.001％时有一定困难。近年发展的电热氢化锡原子吸收法灵敏度达0.nppb,无论采用何种方法测定,大量基体均存在着不同程度的干扰。本文提出在测定溶液中加入酒石酸钠以降低酸度的影响。采用小型硅胶柱分离干扰元素,用小体积低浓度HCl为洗脱液,改善了测定下限。样品处理方法简便,取样量少(0.1～0.3克),适合于含量在0.01～0.00004％锡的测定。测定结果与发射光谱相符。
Existing spectrophotometric and flame atomic absorption spectrometry for the determination of trace amounts of tin in lead and its alloys have had some difficulties in the determination of tin content below 0.001%. In recent years, the development of electrothermal hydrogenated tin atomic absorption spectrometry sensitivity of 0.nppb, no matter what method of determination, a large number of substrates exist in varying degrees of interference. This paper presents the effect of adding sodium tartrate to the assay solution to reduce acidity. Interference elements were separated on a small silica gel column and the lower limit of determination was improved with a small volume of low concentration HCl as the eluent. The sample processing method is simple, the sampling amount is small (0.1 ~ 0.3 g), suitable for the determination of tin content of 0.01 ~ 0.00004%. The measured results are consistent with the emission spectra.