应用ICP-MS测定酱腌菜中铅、砷含量的方法研究

Research on Detection of Lead,Arsenic Content in Pickles by ICP-MS

目的:建立电感耦合等离子体质谱(ICP-MS)测定酱腌菜中铅和总砷含量的方法。方法:样品在硝酸介质中经微波消解,消解液用ICP-MS同时测定酱腌菜中铅和总砷的含量。结果:ICP-MS测定酱腌菜中铅和总砷标准曲线线性关系良好,相关系数分别为0.999和1.000;加样回收率分别为97.6%和108.3%,另利用10批市售样品与国标测定铅和总砷方法对比,相对偏差均小于20%,在误差允许范围内。结论:微波消解ICP-MS方法简便、快速、准确、可靠,适用于酱腌菜中铅和总砷的同时测定。

Objective： To set up a method for simultaneous determination of lead, arsenic content in pickles by microwave digestion-inductively coupled plasma-mass spectrometry （ICP-MS）. Methods： The pickles samples are digested in nitric acid solution with microwave digestion system, and the content of lead, arsenic in the digestion solution is determined simultaneously by ICP-MS. Results： The standard curve of ICP-MS determination of lead and total arsenic in pickles has a good linear relationship. The correlation coefficient is 0. 999 and 1. 000; the recoveries are 97.6% and 108.3%. This method has good linear relationship and high recovery. Then contrast with the national standard method for the determination of lead and total arsenic by using 10 batches of commercially available samples, the relative deviations are all less than 20%, in the range of allowable error. Conclusion： This method has simple operation, rapid analysis, high accuracy, and is reliable, and it can be applied for simultaneous determination of lead, arsenic content in pickles samples.