ABSTRACT
Nitrogen oxide is attracted by the magnetic field and therefore is detectable by a paramagnetic analyzer. The oxides of nitrogen are measured both in ambient air and in the gases emitted by industry. There have been limited reports of applications for analysis of oxides of nitrogen by gas chromatography. The colorimetric method is specific for nitrogen dioxide. In order to analyze for nitric oxide, an oxidation step is required. Nondispersive infrared analyzers are suitable for the determination of nitric oxide analysis. Nitric oxide is oxidized to nitrogen dioxide by air, especially rapidly at high concentrations, and NO2 condenses and dimerizes at high concentrations. It is important to calibrate over a range of nitric oxide concentrations and at various humidity levels. The chemilumines-cent method utilizes the reaction between ozone and nitric oxide. In the chemiluminescent method, a catalytic reduction of nitrogen dioxide to nitric oxide is required.
