Objective To establish a evaluation model of uncertainty for determination of total mercury in paddy rice samples by microwave digestion and atomic fluorescence spectrometer. Methods According to the CNAS-GL006:2018, a mathematical model for uncertainty evaluation was established. The component of uncertainty was quantified, and the expanded uncertainty was calculated. Results The expanded uncertainties of the methods was 0.020 mg/kg (k=2), when the determination results of total mercury were 0.0338 mg/kg. Conclusions The main factors affecting the uncertainty of total mercury determination are sample preparation process, standard deviation under repeated conditions and standard substance.
标题：原子荧光法测定稻谷中总汞含量的不确定度评定
英文标题：Uncertainty evaluation for determination of total mercury content in paddy rice by atomic fluorescence spectrometery
