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通过对ICP-MS工作参数及相关化学条件的优化,建立了ICP-MS测定铅基板栅合金中La,Ce的方法。样品采用HNO3溶解后,以H2SO4作为沉淀剂,基体中绝大部分的Pb生成PbSO4形式的沉淀,降低了Pb对测定的干扰,实现了ICP-MS测定铅基板栅合金中的La和Ce。La和Ce的检出限分别为0.07μg/L和0.13μg/L,加标回收率分别为92.5%和111.0%,RSD分别为0.6%和1.2%。对铅基板栅合金样品的分析结果表明,其精密度和准确度均满足痕量分析的要求。
Through the optimization of ICP-MS working parameters and related chemical conditions, a method of determining La and Ce in lead-based gate alloy by ICP-MS was established. After HNO3 was dissolved in the sample, H2SO4 was used as the precipitating agent. Most of the Pb in the matrix was precipitated in the form of PbSO4, which reduced the interference of Pb with the determination. The determination of La and Ce in lead-based gate alloy by ICP-MS was achieved. The detection limits of La and Ce were 0.07μg / L and 0.13μg / L, respectively, and the recovery rates were 92.5% and 111.0% respectively. The RSDs were 0.6% and 1.2% respectively. Analysis of the lead-based gate alloy samples showed that both the precision and the accuracy meet the requirements of trace analysis.