二苯碳酰二肼分光光度法测定无组织废气中铬酸雾的测量评定

Evaluation of Uncertainty for Determination of Chromate fog in Unorganized Waste Gas by Diphenyl Carbazide Spectrophotometric Method

建立二苯碳酰二肼分光光度法测定无组织废气中铬酸雾不确定度的评定方法,分析不确定度的来源,并对各不确定度分量进行量化。结果表明,影响无组织废气中铬酸雾测量不确定度主要因素为标准工作曲线的拟合及样品测量重复性引入的不确定度,污染物浓度较低时,测量仪器引入的不确定度较大。

This paper established a method for evaluating uncertainty of chromate fog in unorganized waste gas by diphenyl carbazide spectrophotometric method and analysised the sources of uncertainty, as to quantify the factors of uncertainty. The result showed that the main influential factors of uncertainty were fitting of the calibration curves and reproducibility of the measurements. The uncertainty of measurement instrument is larger than that at lower pollutants concentrations.