二氧化氮标准物质校准氮氧化物分析仪的差异性

采用一氧化氮、二氧化氮标准物质对化学发光法的氮氧化物分析仪进行校准,并分析校准系统中零气源、连接管路、动态气体校准仪和标准物质对二氧化氮校准的影响,发现一氧化氮标准物质中的二氧化氮杂质会影响氮氧化物的校准结果,得出氮氧化物分析仪校准需要进行二氧化氮补偿的结论;同时,通过比较国产二氧化氮和进口二氧化氮标准物质产生的校准结果,得出进口二氧化氮标准物质较国产二氧化氮标准物质的稀释结果具有更好的稳定性和一致性。

Differential Study on Calibration of Nitrogen Oxides Analyzers by Nitrogen Dioxide Standard Substance

The nitric oxide, nitrogen dioxide standard material were adopted to calibrate nitrogen oxides analyser of chemiluminescence in this research. By analysing the impact of the zero gas source in the calibration system, connecting line, dynamic calibration gas meter and standard material on the nitrogen dioxide calibration, it was found that the nitrogen dioxide impurities in nitric oxide standard substances might affect the results of nitrogen oxides calibration, thus came to the conclusion that nitrogen oxides analyser calibration need to compensate for nitrogen dioxide. At the same time, by comparing the calibration results of domestic and imported nitrogen dioxide standard substance, it was concluded that the dilution results of imported nitrogen dioxide standard substance are more stable and consistent than those of domestic nitrogen dioxide standard substance.