Objective To evaluate the uncertainty in determination of lead in pickled vegetables by atomic absorption spectrometry (AAS). Methods The uncertainty caused by various factors in the whole process of determination was analyzed, including weighing, solution preparation, microwave digestion, the apparatus and calibration fitting. Results The synthetic uncertainty in determination of lead in pickled vegetables was 3.02% and the expanded uncertainty was 6.04%. The content of lead in pickled vegetables was (2.46±0.15) mg/kg (P=95%, k=2). Conclusion The uncertainty of this method is mainly caused by microwave digestion, calibration fitting and AAS error.
标题:原子吸收法测定泡菜中铅含量的不确定度评定
英文标题:Uncertainty evaluation for determination of lead in pickled vegetables by atomic absorption spectrometry