引用本文:曹芹.定电位电解法测定烟气中氮氧化物的不确定度评定——以湿法脱硫除尘电厂为例[J].环境监控与预警,2017,9(6):33-35
CAO Qin.Uncertainty Evaluation in Determination of Nitrogen Oxides from Flue Gas by Fixed Potential Electrolysis Method ——Taking Wet Desulfurization and Dust Removal Power Plant as An Example[J].Environmental Monitoring and Forewarning,2017,9(6):33-35
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定电位电解法测定烟气中氮氧化物的不确定度评定——以湿法脱硫除尘电厂为例
曹芹
镇江市环境监测中心站,江苏 镇江 212009
摘要:
以某湿法脱硫除尘电厂为例,对定电位电解法测定烟气中氮氧化物的不确定度进行评定。分析认为,测量结果的不确定度可能来自于仪器的校准过程、重复性测量过程和其他气体或杂质的干扰,通过将定电位电解法和紫外分光光度法进行对比分析,确定其他气体或杂质的干扰在本分析过程中造成的不确定度可以忽略。最终计算得出,此次使用3012H型自动烟尘测试仪测量氮氧化物的相对扩展不确定度为±6.57%,其中B类不确定度分量的贡献较大,在分析过程中应加强仪器的维护与保养。
关键词:  氮氧化物  不确定度  评定  定电位电解法
DOI:
分类号:O659
文献标识码:B
基金项目:
Uncertainty Evaluation in Determination of Nitrogen Oxides from Flue Gas by Fixed Potential Electrolysis Method ——Taking Wet Desulfurization and Dust Removal Power Plant as An Example
CAO Qin
Zhenjiang Environmental Monitoring Center Station,Zhenjiang,Jiangsu 212009,China
Abstract:
Taking wet desulfurization and dust removal power plant as an example, this work evaluated the uncertainty in determination of nitrogen oxides from flue gas by fixed potential electrolysis method. As it shows, the measurement uncertainty may come from instrument calibration, repeat measurement and interference of other gas or impurities. By comparison analysis of fixed potential electrolysis method and ultraviolet spectroscopy method, it is sure that the uncertainty caused by interference of other gas or impurities could be ignored. The final calculation showed that the relative expanded uncertainty was ±6.57% in determination of nitrogen oxides by 3012H automatic soot analyzer. Uncertainty B contributes the most to the relative expanded uncertainty, which indicates more frequency of instrument maintenance.
Key words:  Nitrogen oxide  Uncertainty  Evaluation  Fixed potential electrolysis method