微波消解-电感耦合等离子体质谱法测量小麦粉中铅、镉、砷和铬

在我国局部都存在不同程度的铅、镉、砷和铬的土壤和水资源污染，土壤和水域中的有毒有害元素经食物链累积在人体，对人们的身体造成极大的危害，因此对食品中这些限量元素进行准确高效定量非常必要。本文建立了微波消解-电感耦合等离子体质谱(ICP-MS)法对小麦粉中的Pb、Cd、As和Cr进行测量，测量方法采用内标法，内标元素选择Rh、In和Bi。另外对微波消解前处理方法和ICP-MS使用参数进行了优化，测量方法简单高效。工作标准曲线呈良好的线性关系，相关系数均大于0.9999。该方法采用GBW(E)100493小麦粉标准物质和NIST 1567b Wheat Flour对本实验所采用的方法进行验证，结果显示测量值和标准值一致，表明本实验中小麦粉中Pb、Cd、As和Cr的测定方法是准确可靠的。

Determination of Lead, Cadmium, Arsenic and Chromium in wheat flour by microwave digestion and inductively coupled plasma mass spectrometry

In some parts of China, soil and water resources are polluted with different degrees for lead, cadmium, arsenic and chromium. These toxic and harmful elements in soil and water enter the human body through the food chain, causing great harm to people''s health. Therefore, it is necessary to accurately and efficiently quantify these limited elements in food. In this paper, microwave digestion and inductively coupled plasma mass spectrometry(ICP-MS) were stablished to measure Pb, Cd, As and Cr in wheat flour. The internal standard method was adopted, Rh, In and Bi were selected as the internal standard elements. In addition, the pretreatment method of microwave digestion nd the instrument conditions were optimized. The detection method was quick and simple. The working standard curves show a good linear relationship with correlation coefficients greater than 0.9999. GBW(E)100493 and Wheat Flour SRM 1567B were used to verify the method used in this experiment. The results showed that the measured values were consistent with the standard values, indicating that the method used in this experiment is reliable for the determination of Pb, Cd, As and Cr in Wheat Flour.