电感耦合等离子体质谱法测定辣椒镉含量中不确定度的评估

Evaluation of uncertainty for the determination of cadmium in peppers by inductively coupled plasma mass spectrometry

中文关键词:  镉  电感耦合等离子体质谱法  辣椒  不确定度

英文关键词:cadmium  inductively coupled plasma mass spectrometry  peppers  uncertainty

中文摘要:

      目的 电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry, ICP-MS)测定辣椒中镉含量, 评估测定过程产生的不确定度。方法 建立数学模型, 分析识别试样称量、试样定容、标准物质、标准溶液的配制、标准曲线的拟合、重复测量、回收率实验等不确定度来源, 各不确定度分量被量化, 计算合成标准不确定度。结果 辣椒中镉含量不确定度测定结果为: mg/kg, k=2。结论 测定过程不确定度主要来源于标准溶液配制和标准曲线拟合。

英文摘要:

      Objective To determine the content of cadmium (Cd) in peppers by inductively coupled plasma mass spectrometry (ICP-MS), and to evaluate the uncertainty in the determination. Methods The mathematical model of uncertainty evaluation was established to analyze and identify the sources of uncertainty evaluation such as sample weighing, sample constant volume, standard substance, preparation of standard solution, standard curve fitting, repeatability measurement and recovery test. The uncertainty components were quantified, the standard combined uncertainty was calculated. Results The determination result of the uncertainty of cadmium content in pepper was mg/kg, k=2. Conclusion The uncertainty of determination process mainly comes from the preparation of standard solution and the fitting of standard curve.