石墨炉原子吸收光谱测定加热不燃烧烟烟草材料中铅含量的不确定度评定

为评价石墨炉原子吸收光谱法(GF-AAS)测定加热不燃烧烟(HNB)烟草材料中铅含量检测方法的可靠性和检测结果的准确性,采用自下而上法(bottom-up)评定铅含量检测结果的不确定度,分析了测量不确定度的来源及各不确定度分量的影响程度.结果表明,加热不燃烧烟烟草材料中铅含量为2.02 mg/kg,扩展不确定度为0.26 mg/kg(k=2).测量不确定度主要来源于标准曲线拟合和仪器稳定性.故选择适宜的试验方案及试剂,设置合适的仪器参数,确保良好的仪器状态及性能,是获得准确检测结果的前提条件.

Uncertainty Evaluation of Determination of Lead in Tobacco Material of Heat-Not-Burn by Graphite Furnace Atomic Absorption Spectrometry

In order to verify the reliability of the method for detecting the contents of lead (Pb) in tobacco material of heat-not-burn (HNB) by graphite furnace atomic absorption spectrometry (GF-AAS) and the accuracy of the results, the measurement uncertainty was evaluated using the "bottom-up" to analyze the source of the uncertainty and the influence from uncertainty components. The results showed that:the content of Pb in tobacco material of HNB was 2.02 mg/kg, and the expanded uncertainty of Pb was 0.26 mg/kg(k=2). The standard curve fitting process and the stability of the instrument were the main sources of uncertainty. Adopting an appropriate experiment scheme and reagents, and setting the appropriate instrument parameters can ensure the accuracy and reliability of the results.