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目的建立电感耦合等离子体串联质谱法(inductively coupled plasma-tandem mass spectrometry,ICP-MS/MS)测定富硒农产品中超痕量硒含量的分析方法。方法采用微波消解法处理富硒农产品,使用ICP-MS/MS测定超痕量硒。结果富硒农产品中超痕量硒检出限0.002214μg/L,线性良好(线性相关系数大于0.999)。6种实物标样的测定结果与标准值一致,精密度实验相对标准偏差为0.58%~6.3%,加标回收率范围79.6%~109%,均符合要求。结论本方法具有高灵敏度、无干扰、稳定性好等优势,可用于富硒农产品中超痕量硒含量的测定。
Objective To establish an analytical method for the determination of ultra-trace selenium in selenium-enriched agricultural products by inductively coupled plasma-tandem mass spectrometry (ICP-MS / MS). Methods Selenium-enriched agricultural products were treated by microwave digestion method, and ultra-trace selenium was determined by ICP-MS / MS. Results The detection limit of ultra-trace selenium in selenium-enriched agricultural products was 0.002214 μg / L with good linearity (linear correlation coefficient greater than 0.999). The results of six kinds of physical standards were consistent with the standard values. The relative standard deviations (RSDs) of precision experiments were 0.58% ~ 6.3%, and the recoveries ranged from 79.6% to 109%. All of them met the requirements. Conclusion The method has the advantages of high sensitivity, no interference and good stability, and can be used for the determination of ultra-trace selenium in selenium-enriched agricultural products.