石墨炉法测定生活饮用水中的镉含量的不确定度评估

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

对生活饮用水中镉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,最终得到镉含量的扩展不确定度。结果表明影响测量不确定度的主要因素是标准曲线的线性回归带来的不确定度,其它因素所带来的不确定度都是次要的。在测量时,对其进行严格全面的控制,从而提高测量结果的准确性。

In order to evaluate the uncertainty of the results, the admiumin of the samples were measured. According to the analysis, the corresponding mathematical model with using atomic absorption spectrometry was established to determination of admiumin in the drinking water. Uncertainty of each component synthesis, the expanded uncertainty of admiumin content was 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.