质控图在电感耦合等离子体质谱法测定食品中9种重金属中的应用

目的研究电感耦合等离子体质谱法(inductively coupled plasma-mass spectrometry,ICP-MS法)测定食品中铬、镍、铜、砷、镉、锡、锑、汞、铅9种重金属元素含量的质量控制方法。方法通过测定样品加标回收率,用统计学方法求出相应技术指标,制得多元素回收率质控图。结果 9种重金属元素的回收率均在上、下控制限之间,代表此段时间测定过程受到控制,该批数据可信;但仍旧出现若干超过或低于警戒限的点。结论 9个质控图能直观有效地控制ICP-MS测定食品中的9种重金属元素分析质量,确保结果准确可靠。

Quality control charts used in the determination of 9 kinds of heavy metal elements in foods by inductively coupled plasma mass spectrometry

Objective To study the quality control methods in the determination of chromium, nickel, copper, arsenic, cadmium, tin, antimony and mercury in food by inductively coupled plasma mass spectrometry (ICP-MS). Methods By measuring the spiked recovery rate of the sample, the corresponding technical indicators were obtained by statistical methods, and the quality control charts of the multi-element recovery rate were made. Results The recovery rates of the 9 kinds of heavy metal elements were between the upper and lower control limits, which meant that the measurement process was controlled during this period, and the batch data was credible; however, there were still some points those exceed or fall below the warning limit. Conclusion Nine quality control charts can directly and effectively control the analytical quality of 9 kinds of heavy metal elements in food by ICP-MS to ensure accurate and reliable results.