作者：赵小学1, 赵宗生1, 王玲玲2, 付燕利1
作者单位：1. 济源市重金属监测与污染治理重点实验室, 河南济源 459000;
2. 河南省环境监测中心, 河南郑州 450004
关键词：微波消解; 电感耦合等离子-质谱仪; 小麦; 有害金属元素;
摘要：
提出微波消解-电感耦合等离子体质谱法测定小麦中As、Cd、Pb的检测方法。样品经HNO3微波消解,分别采用Rh、In、Tb作为内标元素和碰撞池技术以及干扰方程校正来消除基体干扰和质谱干扰;通过小麦粉标准物质和加标回收率验证了检测方法的准确度和可靠性。结果显示:标准物质测试结果均在质控范围,As、Cd、Pb的回收率和相对标准偏差分别为As:87.5%~108%,2.1%~4.9%;Cd:93.0%~106%,2.0%~2.3%;Pb:113%~122%,5.2%~5.3%。该方法快速、准确,适合小麦中有害元素As、Cd、Pb的同时测定。
Rapid determination of As,Cd and Pb in wheat by microwave digestion combined with ICP-MS
ZHAO Xiao-xue1, ZHAO Zong-sheng1, WANG Ling-ling2, FU Yan-li1
1. Jiyuan City Key Laboratory of Heavy-mental Monitoring and Pollution Control, Jiyuan 459000, China;
2. Henan Province Environmental Monitoring Centre, Zhengzhou 450004, China
Abstract: The analytical method for determining As,Cd and Pb in wheat was established with microwave-inductively coupled plasma-mass spectrometry (ICP-Ms). After microwave digestion with HNO3,the samples were determined by ICP-MS,which used Rh,In and Tb as internal elements, and adopted collision cell and interference correction equation to eliminate matrix interference and mass spectral interference,respectively. The accuracy and reliability of the method were verified with certified reference materials (wheat flour) and recoveries. The determination results were in the range which was permitted,and the recoveries and RSD were respectively as followings:As,87.5%~108%, 2.1%~4.9%;Cd,93.0%~106%,2.0%~2.3%;Pb,113%~122%,5.2%~5.3%. This method is rapid, accurate and applicable for the simultaneous analysis of harmful mental elements in wheat.
Keywords: microwave digestion; ICP-MS; wheat; harmful mental element
2014, 40(6): 42-44 收稿日期: 2014-2-4;收到修改稿日期: 2014-4-20
基金项目: 国家环境保护公益性行业科研专项(201309050);国家重大科学仪器设备开发专项(2011YQ060100)
作者简介: 赵小学(1981-),男,河南济源市人,工程师,主要从事金属分析技术研究。
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