电感耦合等离子体质谱法测定大米粉中砷、镉含量及不确定度评估

Determination of Arsenic and Cadmium in Powdered Rice by Inductively Coupled Plasma-Mass Spectrometry and Evaluation of the Uncertainty

采用微波消解-电感耦合等离子体质谱法(inductively coupled plasma-mass spectrometry,ICP-MS)对样品进行处理与测定,通过创建数学模型,对大米粉中的砷和镉的测定结果进行不确定度评估与分析,最终得出其不确定度分别为(0.182±0.012)mg/kg、(0.262±0.016)mg/kg。不确定度主要来源为标准曲线拟合和测量。可为ICP-MS法测定大米粉中有毒有害元素检测的准确性和方法的可靠性提供依据。

The microwave digest technique combined with inductively coupled plasma-mass spectrometry(ICP-MS)was used for the determination of arsenic and cadmium in powdered rice.The measurement uncertainty was evaluated by establishing a mathematical model.The measurement results of arsenic and cadmium in powdered rice were(0.182±0.012)mg/kg and(0.262±0.016)mg/kg,respectively,with the coverage probability of 95%.The major uncertainty components were from standard curve fitting and test solution measurement.The research method can be used for measurement of harmful elements in powdered rice by ICP-MS.