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7mL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0.002~0.440μg/kg,定量限为0.006~1.480μg/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。
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.
作者
许金媛
熊晓辉
吴震威
卞疆
游京晶
黄丹萍
XU Jin-Yuan;XIONG Xiao-Hui;WU Zhen-Wei;BIAN Jiang;YOU Jing-Jing;HUANG Dan-Ping(The State Light Industry Food Quality Supervision and Detection Station,Nanjing 210009,China;College of Food Science and Light Industry,Nanjing Tech University,Nanjing 210009,China)
出处
《食品安全质量检测学报》
CAS
2020年第20期7293-7297,共5页
Journal of Food Safety and Quality
关键词
电感耦合等离子体质谱法
大米
稀土元素
inductively coupled plasma mass spectrometry
rice
rare earth elements
