A Standalone True NO_2 Converter for Upgrading Chemiluminescence Analyzers

摘要

Here, we have demonstrated through laboratory and field evaluations of a novel standalone selective photolytic NO_2 converter. We have seen very good agreement between the PhoNO-Chemiluminiscence system with direct CRDS/CAPS systems as well as a regular FRM heated metal molybdenum NO_2 converter instruments. Results from field deployment also show a fast response of the photolytic system compared to the heated metal converter system. Results from the 2017 summer months are underway to ascertain NO_2 overestimation by the heated metal converters as well evaluating its performance in the presence of potential interference species such as multifunctional alkyl nitrates. The PhoNO was further evaluated during the Lake Michigan Ozone Study in June 2017. Data Analyses are currently ongoing. These results together with further interference testing would be crititcal in the certification process of this PhoNO device for use with existing NO_x instruments which employ cheluminiscence detection techniques.