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

摘要：目的 采用电感耦合等离子体质谱法(ICP-MS)测定辣椒中镉（Cd）含量，及评估测定过程产生的不确定度，以提高定量分析结果的可靠性。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、回收试验等不确定度来源，量化各不确定度分量，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：。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。电感耦合等离子体质谱法测定辣椒中镉含量准确度高，重复性好，建立的不确定度评估能保证分析结果的质量。

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

ABSTRACT: Objective To determin the content of cadmium (Cd) in peppers by inductively coupled plasma mass spectrometry (ICP-MS),and to evaluate the uncertainty in the determination,in order to improve the reliability of the quantitative analysis. Method The mathematical model of uncertainty evaluation was established,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 was analyzed and identified;each uncertainty component was quantified,the standard combined uncertainty was calculated.Result The uncertainty of cadmium content in peppers was determined as: . Conclusion The inductively coupled plasma mass spectrometry (ICP-MS) method for the determination of cadmium in peppers is highly accurate and reproducible, and the uncertainty assessment established can ensure the quality of the analytical results.