目的 建立电感耦合等离子体质谱法(ICP-MS)测定金线莲中铜(Cu)、砷(As)、镉(Cd)、汞(Hg)、铅(Pb)5种重金属元素。方法 样品微波消解处理后,采用电感耦合等离子体质谱法测定。结果 Cu、As、Cd、Hg、Pb标液工作曲线的线性良好,相关系数大于0.998,Cu的平均回收率104.3%,RSD为4.0%,As的平均回收率102.2%,RSD为4.3%,Cd的平均回收率100.5%,RSD为0.4%,Hg的平均回收率101.0%,RSD为3.6%,Pb的平均回收率101.1%,RSD为1.1%。结论 该方法稳定可靠,灵敏度高,重现性好,准确快速,可用于同时测定金线莲中Cu、As、Cd、Hg、Pb 5种重金属的元素。

Objective To establish the inductively coupled plasma mass spectrometry (ICP-MS) method for content determination of five kinds of heavy metals (copper, arsenic, cadmium, mercury, and lead) in Anoectochilus roxburghii. Methods After the treatment of microwave digestion, ICP-MS method was used in the determination. Results The standard liquid working curves of Cu, As, Cd, Hg, and Pb had good linearity, with the correlation coefficients of more than 0.998. The average recovery of Cu was 104.3% with relative standard deviation (RSD) of 4.0%, the average recovery of arsenic was 102.2% with RSD of 4.3%, the average recovery Cd was 100.5% with RSD of 0.4%, the average recovery rate of Hg was 101.0% with RSD of 3.6%, and the average recovery of Pb was 101.1% with RSD of 1.1%. Conclusion The method is stable, reliable, fast, and accurate, and has high sensitivity and good reproducibility. It can be used for the simultaneous determination of Cu, As, Cd, Hg, and Pb in A. roxburghii .