摘要
目的:利用电感耦合等离子体质谱(ICP-MS)法测定花生中镉的标准方法,评定相应的测量结果的不确定度。方法:建立数学模型;通过对测定过程中不确定度分量来源的分析,计算各不确定度分量,最后计算出合成标准不确定度和扩展不确定度,以测量不确定度的形式对测量结果进行表述。结果:花生样品中镉含量为(162±5)μg/kg,k=2,符合国家限量标准;本实验方法测量不确定度的主要来源有4个方面,按引入的不确定度分量贡献大小排序,依次为方法重复性、标准溶液校准、定容体积、称样量。结论:本评定方法适用于微波消解电感耦合等离子体质谱仪法测量食品中元素含量的不确定度评定。
Objective： To establish a determination method of cadmium in peanuts by inductively coupled plasma-mass spectroscopy （ICP-MS） and evaluate the uncertainty of determination results. Methods： A mathematic model was established by analyzing the uncertainty sources from different parts. The final uncertainty degree was calculated by standard uncertainty and extended uncertainty during measurements. Results： The cadmium content in peanuts was determined to be （162 ± 5） μ g/ kg with a k value of 2, which met the national standard. The major uncertainty was attributed to four sources such as repeatability of measurement, calibration of standard solution, volume and sampling. Conclusion： This method is applicable to the evaluation of uncertainty during component determination in foods by ICP-MS.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2011年第14期285-288,共4页
Food Science
关键词
电感耦合等离子体质谱仪
镉
不确定度
花生
校准
inductively coupled plasma-mass spectroscopy （ICP-MS）： cadmium
uncertainty evaluation
peanut
calibration
