石墨炉法测定生活饮用水中铅含量不确定度评定

Evaluation of Drinking Water Uncertainty for the Determination of Lead Content by Graphite Furnace Method

对生活饮用水中铅含量测定结果的不确定度进行了评估。根据分析方法,建立了原子吸收光谱法测定生活饮用水的数学模型,对各不确定度分量进行合成,最终得到铅含量的扩展不确定度。从本文得出的结果可以看出,标准曲线的线性拟合分量是不确定度的主要来源,其他因素,带来的不确定度相比之下,可以忽略不计。因此,测量时如果可以提高线性拟合的准确性,就可以使结果更加准确。

In order to evaluate the uncertainty of the results, the lead of the samples were measured.According to the analysis, the corresponding mathematical model with using atomic absorption spectrometry was established to determination of lead in the drinking water.Uncertainty of each component synthesis and the expanded uncertainty of lead content were ultimately found out.The results showed that the major influential factors which resulted in the uncertainty of the measurement were caused by the uncertainty of the standard curve linear regression, by other factors brought uncertainty caused were secondary.The control on the standard curve should be strengthened to improve the accuracy of determination.