电感耦合等离子体质谱法测定大米中16种稀土元素

Determination of 16 kinds of rare earth elements in rice by inductively coupled plasma mass spectrometry

中文关键词:  电感耦合等离子体质谱法  大米  稀土元素

英文关键词:inductively coupled plasma mass spectrometry  rice  rare earth elements

中文摘要:

      目的 建立电感耦合等离子体质谱法测定大米中16种稀土元素含量。方法 称取0.2 g左右的大米, 加入7 mL硝酸, 在120 ℃下进行预消解, 预消解完成后进行微波消解, 定容摇匀待测。在已优化过的电感耦合等离子体质谱仪上测定大米中16种稀土元素, 并对其线性回归方程、检出限、精密度和回收率等进行考察。结果 16种稀土元素在一定范围内线性关系良好, 相关系数均大于0.995, 方法检出限为0.002~ 0.440 μg/kg, 定量限为0.006~1.480 μg/kg。各元素加标回收率在85.7%~107.9%, 测定结果相对标准偏差(relative standard deviation, RSD)在1.8%~4.5%。结论 该检测方法简单、快速、选择性好、灵敏度和回收率高, 适用于大米中多种稀土元素的测定。

英文摘要:

      Objective To establish a method for determination of 16 rare earth elements content in rice produced in Jiangsu province. Methods About 0.2 g of rice was weighed, and 7 mL nitric acid was added, and pre-digestion was carried out at 120 ℃. After the pre-digestion, microwave digestion was carried out, and the constant volume was shaken for testing. Toally 16 kinds of rare earth elements in rice were determined by inductively coupled plasma mass spectrometry (ICP-MS). The linear regression equation, detection limit, precision and recovery were investigated. Results Toally 16 kinds of rare earth elements had a good linear relationship within a certain concentration range, and the correlation coefficients were all greater than 0.995. The limits of detection were obtained between 0.002?0.440 μg/kg, and the limits of quantification were 0.006?1.480 μg/kg. The recovery rates were 85.7%?107.9%, with the relative standard deviations (RSDs) of 1.8%?4.5%. Conclusion The method is simple, rapid, good selectivity, high sensitivity and recovery, and suitable for the determination of rare earth elements in rice.