目的对空气中二氧化硫浓度测定进行不确定度评定。方法通过分析测定空气中二氧化硫浓度方法,找出引起测量不确定度的来源并对其进行量化,进行不确定度的评定。结果用本方法测定的二氧化硫浓度相对合成标准不确定度为0.108,如果测定样品的浓度为0.410 mg/m3,则标准不确定度为0.044 mg/m3。结论测定空气中二氧化硫浓度的主要不确定度来自于采样体积的测定、标准物质的不确定度及实验总体误差。 Objective To evaluate the uncertainty of the concentration of sulfur dioxide in the air. Methods By analyzing and measuring the concentration of sulfur dioxide in the air, the sources of measurement uncertainty were identified and quantified, and the uncertainty was evaluated. Results The relative standard deviation of the concentration of sulfur dioxide determined by this method was 0.108, and the standard uncertainty was 0.044 mg / m3 if the concentration of the measured sample was 0.410 mg / m3. Conclusions The major uncertainties in determining the concentration of sulfur dioxide in the air come from the measurement of the sample volume, the uncertainty of the reference material, and the overall experimental error.