电感耦合等离子体质谱法测定猪肝、奶粉和茶叶中16种稀土元素

Determination of 16 kinds of rare earth elements in pig liver, milk powder and tea by inductively coupled plasma mass spectrometry

中文关键词:  微波消解  电感耦合等离子质谱法  稀土元素  食品

英文关键词:microwave digestion  inductively coupled plasma mass spectrometry  rare earth element  food

中文摘要:

      目的 建立电感耦合等离子体质谱法(inductively coupled plasma mass spectrometery, ICP-MS)检测食品中稀土元素的分析方法。方法 样品加入硝酸浸泡后再加入过氧化氢, 经微波消解处理呈淡黄色澄清透明样液, 采用铟作内标、在氦模式下用ICP-MS同时测定16种稀土元素的含量。结果 所测定的16种稀土元素线性相关系数达到0.999以上, 方法检出限为0.00063~0.014 μg/kg; 同时采用奶粉和猪肝作为基质本底, 用加标回收评价了该方法的精密度和重现性, 回收率为80.7%~117%, 相对标准偏差为0.29%~4.51%; 国家标准物质茶叶GBW10052和GBW10016的测定值与标准值吻合。结论 该方法操作简便快捷, 灵敏度高, 准确度高, 重现性好, 适用于多种类食品样品中稀土元素的检测。

英文摘要:

      Objective To establish a method for the determination of rare earth elements in food samples by inductively coupled plasma mass spectrometry (ICP-MS). Methods The sample was soaked in nitric acid and then added with hydrogen peroxide. After microwave digestion, the sample solution was light yellow, clear and transparent. Indium was used as the internal standard, and the content of 16 rare earth elements was simultaneously determined by ICP-MS in helium mode. Results The linear correlation coefficients of the 16 rare earth elements measured were above 0.999, and the limits of detection of the method were 0.00063~0.014 μg/kg. At the same time, taking milk powder and pig liver as the matrix background, and the precision and reproducibility of the method were evaluated by standard recovery. The recovery rates were 80.7%–117%, and the relative standard deviations were 0.29%–4.51%. The measured values of the national standard tea GBW10052 and GBW10016 were consistent with the standard values. Conclusion This method is simple and fast, with high sensitivity, high accuracy and good reproducibility, and is suitable for the detection of rare earth elements in many kinds of food samples.