应对ICP-MS测定化妆品的汞污染清洗技术研究

Cleaning Technology for Mercury Pollution in Cosmetics by ICP-MS

摘要: 电感耦合等离子体质谱仪(ICP-MS)在测定汞元素时普遍存在记忆效应，尤其是测定汞含量可能较高的美白祛斑类化妆品时，超标数万甚至百万倍的汞含量直接污染整个试验过程，包括前处理系统，仪器的进样系统、透镜系统，甚至是四级杆系统等。本文以Agilent 7900 ICP-MS的日常检测所碰到汞污染情况为例，在使用5%盐酸和200 μg/L金溶液分别清洗60 min后，将仪器的进样系统、透镜系统、八级杆系统等进行拆洗，从而达到快速将被高浓度汞污染的仪器清洗干净，使后面的实验结果不受到影响。

Abstract: The mercury memory effect was existed in the determination by inductively coupled plasma mass spectrometer (ICP-MS), especially in the determination of whitening cosmetics with possibly high mercury content, thousands and millions of mercury will pollute the whole test process, including pretreatment system, instrument injection system, lens system, and even four-stage rod system. Taking the mercury pollution encountered in the daily detection for Agilent 7900 ICP-MS as an example, the instrument is cleaned by using 5% hydrochloric acid and 200 μg/L gold solution for 60 min, and then the sample injection system, lens system, eight stage rod system, etc. of the instrument are disassembled and cleaned, so as to quickly clean the instrument polluted by high concentration mercury and make subsequent experiments unaffected.