Relationships between nitrous acid and other nitrogen oxides in urban air

Nitrous acid (HNO 2), nitric acid (HNO 3), nitric oxide (NO) and nitrogen dioxide (NO 2) were measured over a four day period in Clairmont, CA. Concentrations of each nitrogen oxide (NO x) compound varied diurnally during the study period HNO 3, NO 2, and NO generally reached maxima during daylight...

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Bibliographic Details
Published in:Chemosphere (Oxford) 1995, Vol.31 (3), p.2945-2957
Main Authors: Cobb, G.P., Braman, R.S.
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric pollution
Exact sciences and technology
Pollutants physicochemistry study: properties, effects, reactions, transport and distribution
Pollution
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Summary:Nitrous acid (HNO 2), nitric acid (HNO 3), nitric oxide (NO) and nitrogen dioxide (NO 2) were measured over a four day period in Clairmont, CA. Concentrations of each nitrogen oxide (NO x) compound varied diurnally during the study period HNO 3, NO 2, and NO generally reached maxima during daylight hours. Conversely, HNO 2 concentrations were highest at night. HNO 3 and HNO 2 concentrations increased with increasing NO and NO 2. HNO 3 dependance became limited at high NO 2 and NO. HNO 2 concentrations declined when high NO and NO 2 concentrations were present. The decline in HNO 2 is postulated to result from direct photolysis during the time periods of NO and NO 2 maxima or from reactions to form HNO 3.
ISSN:0045-6535
1879-1298
DOI:10.1016/0045-6535(95)00154-Z