电感耦合等离子体质谱法测定谷物中砷和镉的不确定度评定  

Uncertainty Evaluation in Determination of Arsenic and Cadmium in Cereals by Inductively Coupled Plasma Mass Spectrometry

作　　者：陆美斌[1,2,3] 李为喜[1,2,3] 李静梅[1,2,3] 杨秀兰[1,2,3] 刘中笑[4] 高苹[4] 王步军[1,2,3] 

机构地区：[1]中国农业科学院作物科学研究所,北京100081 [2]农业部谷物品质监督检验测试中心,北京100081 [3]农业部谷物产品质量安全风险评估实验室,北京100081 [4]农业部蔬菜品质监督检验测试中心,北京100081

出　　处：《中国食品学报》2014年第5期180-185,共6页Journal of Chinese Institute Of Food Science and Technology

基　　金：农业部农产品质量安全普查项目(20121902)

摘　　要：采用电感耦合等离子体质谱法(ICP-MS)测定谷物中的重金属元素砷(As)、镉(Cd),分析测定过程,确定不确定度来源,建立不确定度评定数学模型。对单个不确定度分量进行合成和扩展,建立ICP-MS测定谷物中As、Cd的不确定度评定方法。结果表明:As含量=(0.33±0.026)mg/kg,K=2;Cd含量=(0.16±0.016)mg/kg,K=2。本方法测定不确定度的主要来源为4个方面,按引入的不确定度分量贡献大小排序依次为溶液测定、测量重复性、样品定容、称样量。The heavy metals of arsenic and cadmium in cereals were measured by inductively coupled plasma mass spectrometry. By analyzing the determination process to find the uncertainy source, establish the mathematical model, combine and expand the single synthesis, the evaluation method of uncertainty was established. The results showed that the content of arsenic in cereals was （0.33 ± 0.026） mg/kg, K=2, and the content of cadmium was（0.16 ± 0.016） mg/kg, K=2. The main uncertainties were attributed to four sources, namely solution determination, measurement repeatability, sample dilution and sampling in decreasing order of uncertainty contribution.

关 键 词：电感耦合等离子体质谱法 不确定度 谷物 砷 镉 

分 类 号：O657.63[理学—分析化学]