基于电感耦合等离子体质谱技术的乳制品中多种元素的半定量分析方法

Determination of multi elements in dairy products by semi quantitative microwave digestion reaction collision cell inductively coupled plasma mass spectrometry

目的采用电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry,ICP-MS)建立乳制品元素分析的He碰撞反应池模式下半定量检测方法。方法称取0.40~0.50 g样品,加入5 m L硝酸和1 m L双氧水消解完全后,碰撞池反应-电感耦合等离子体质谱法半定量测定。结果通过对样品加标回收及对GSB-8乳粉标准物质的半定量分析,结果显示,该方法能够有效消除干扰,实现对Pb、Cd、Hg、As、Cr、Cu、Zn、Ca等72种元素一次性快速测定,测定结果偏差为(-19.6%)^(+4.9%),实际样品回收率为80.4%~104.9%。结论该方法能快速确定样品中存在的元素及浓度范围,可以应用于奶制品元素含量扫描分析,为快速分析评价乳制品中矿物元素提供科学依据。

Objective To establish a semi-quantitative detection method in collision reaction pool for the element analysis in dairy products by inductively coupled plasma mass spectrometry（ICP-MS）. Methods With adding 5 m L nitric acid and 1 m L hydrogen peroxide, 0.40~0.50 g sample was digested, and then it was determined by semi quantitative microwave digestion reaction collision cell inductively coupled plasma mass spectrometry. Results The sample recovery and semi-quantitative analysis of GSB-8 milk standard reference material showed that this method could effectively eliminate the interference. The implementation of Pb, Cd, Hg, As, Cr, Cu, Zn, Ca and other 64 elements could be simultaneously rapidly determined, the result deviation was in range of（-19.6%）^（＋4.9%）, and the recoveries of actual samples were 80.4%~104.9%.. Conclusion This method can quickly determine the elements and the concentration range in samples, which can be applied to analyze the element content in dairy and provide scientific basis for the rapid analysis and evaluation of dairy elements.