目的用原子荧光光度法测定大米中汞含量,评定不确定度。方法样品经微波消解,用原子荧光光度仪检测,应用不确定度评定方法对测量结果进行不确定度分析与评定。结果该检测方法线性良好,相关系数r=0.9992,不确定度报告为(21.69±0.22)μg/kg,k=2。结论本方法可用于大米中汞含量的测定,不确定度评定合理。 Objective To determine the mercury content in rice by atomic fluorescence spectrometry and evaluate the uncertainty. Methods Samples were digested by microwave and detected by atomic fluorescence spectrophotometer. Uncertainty evaluation method was used to analyze and assess the uncertainty of the measurement results. Results The method was linear and the correlation coefficient was 0.9992. The uncertainty was reported as (21.69 ± 0.22) μg / kg and k = 2. Conclusion The method can be applied to the determination of mercury in rice, and the evaluation of the uncertainty is reasonable.