电感耦合等离子体质谱法测定地龙药材中铅、砷、汞、镉、铜元素的残留量

Determination of Pb, As, Hg, Cd, Cu in Pheretima by Inductively Coupled Plasma Mass Spectrometry

摘要: 建立电感耦合等离子体质谱法（ICP-MS）测定不同产地和批次地龙药材中铅（Pb）、砷（As）、汞（Hg）、镉（Cd）、铜（Cu）5种重金属元素的含量. 采用微波消解进行样品前处理，结果表明：5种重金属元素的线性关系良好（r≥0.999 6），平均回收率在92.8%～95.2%范围内，方法的检出限在0.001 0～0.092 mg/kg范围内. 方法灵敏度高，重复性好，方法准确. 不同产地和批次的样品中5种重金属元素均有检出. 地龙药材中Pb、As、Hg、Cd、Cu这5种重金属元素需要重点监控.

Abstract: An Inductively coupled plasma mass spectrometry (ICP-MS) method has been set up to determine the contents of five heavy metal elements, namely lead (Pb), arsenic (As), mercury (Hg), cadmium (Cd) and copper (Cu), in different habitats and batches of Pheretima. The sample was pretreated by microwave digestion. The results showed that the linearity of the five heavy metal elements were good (r≥0.999 6), the average recoveries were in the range of 92.8%~95.2%, and the detection limits of the method were in the range of 0.0010~0.092 mg/kg. The detection method is of highly sensitive, repeatable and accurate. Five heavy metal elements were detected in samples from different habitats and batches. These five heavy metal elements of Pb, As, Hg, Cd and Cu in Pheretima need to be monitored with emphasis.