Objective To evaluate the uncertainty of determination of total arsenic content in rice flour by microwave digestion-atomic fluorescence spectrometry. Methods According to JJF 1059.1-2012 Measurement uncertainty evaluation and expression and CNAS-GL 006-2019 Evaluation guide for uncertainty in chemical analysis, the content of total arsenic in rice flour quality control samples was determined by microwave digestion-atomic fluorescence spectrometry, a mathematical model was established, and the uncertainty components generated in the whole analysis process were evaluated. Results When the arsenic determination result of the quality control samples of rice flour was 0.156 mg/kg, the expansion uncertainty was 0.0067 mg/kg, k=2. Conclusion The uncertainty caused by the influencing factors in the measurement process after quantification indicates that the uncertainty of the experimental process mainly comes from the standard curve fitting, followed by the spiked recovery rate and measurement repeatability.
标题：微波消解-原子荧光法测定大米粉中总砷含量的不确定度评定
英文标题：Uncertainty evaluation for the determination of total arsenic in rice by atomic fluorescence spectrometry with microwave digestion
