Study of the uncertainty in NO2 chemiluminescence measurements due to the NO-O-3 reaction in sampling lines

作者：Doval Minarro Marta; Gonzalez Ferradas Enrique; Barbera Rico Jonathan; Diaz Alonso Fernando; Marzal Martinez Francisco J; Romero Trigueros Cristina

来源：Environmental Science and Pollution Research, 2011, 18(3): 436-445.

DOI：10.1007/s11356-010-0386-z

• Chemiluminescence
• Nitrogen oxides
• Uncertainty
• Ozone
• Residence time

The change in light intensity that takes place when an ambient air sample is drawn into the detection chamber of a chemiluminescence monitor generates changes in the concentrations of several species, such as NO2, NO and O-3. Although this phenomenon has been known for several decades, there is still no commonly accepted approach on when or how to correct for it in NO2 and O-3 readings.
In this work, we have assessed the expanded uncertainty of two chemiluminescence NO (x) analysers commercially available according to EN 14211:2005, with the aim of establishing the maximum allowable standard uncertainty due to the reaction between NO and O-3 in the sampling system.
Although this maximum allowable uncertainty cannot be a universal value-as it will depend on the performance of each analyser-our results have led us to propose the conservative value of 2%. We have also proposed a methodology for improving data quality which could be easily implemented by those responsible for air quality data validation.

• 出版日期2011-3