微波消解－电感耦合等离子质谱法测定蜂胶制品中5种重金属元素的含量

摘要

Objective To establish the analytical method for detecting lead, arsenic, mercury, cadmium and chromium in propolis products by ICP-MS after microwave digestion. Methods After microwave digestion with HNO3 and H2O2, the contents of Pb, As, Hg, Cd and Cr in samples were determined by ICP-MS directly, and the parameters of ICP-MS were optimized and selected. Results This method has well linear relationship in determination of Pb, As, Hg, Cd and Cr ( r ﹥ 0. 999 ) , the detection limit was less than 0. 1 μg/L, the recovery was 91. 70% -116. 34%, and the relative standard deviation were 1. 83% -3. 81% ( n=6 ) . Conclusion This method has good accuracy and precision, high sensitivity, low detection limit, wide linear range, less interference, can be used for the accurate deter-mination of heavy metals in common propolis products.%目的：建立微波消解－电感耦合等离子质谱（ICP－MS）法测定蜂胶制品中常见重金属铅( Pb )、砷( As )、汞( Hg )、镉( Cd )和铬( Cr )的分析方法。方法样品加HNO3和H2O2后采用微波消解进行样品预处理，采用ICP－MS法直接测定试液中Pb，As，Hg，Cd，Cr，并对ICP－MS仪工作参数进行优化和选择。结果该方法测定Pb，As，Hg，Cd，Cr具有良好的线性关系（ r﹥0.999），检出限低（﹤0.1μg／L），回收率为91.70%~116.34%，RSD为1.83%~3.81%（ n＝6）。结论该法具有良好的准确度和精密度，灵敏度高，检出限低，线性范围宽，干扰少，能用于蜂胶制品中常见重金属的准确测定。