Abstract
A chemiluminescent NO/sub x/ analyzer and an ultraviolet photometry ozone analyzer were found to respond to a number of organic pollutants and mixtures in purified air. Two types of interferences were observed with the NO/sub x/ analyzer. A small positive interference as NO was observed with organosulfur compounds. Positive interferences as NO/sub 2/ were observed with nitric acid, methyl nitrate, peroxyacetyl nitrate, N/sub 2/O/sub 5/ (in O/sub 3/-NO/sub 2/ mixtures in the dark), certain nitro aromatics (nitrocresol), and chlorine-containing compounds (ClNO/sub x/) but not with peroxybenzoyl nitrate. The ultraviolet photometry ozone analyzer gave a positive response to ozone-free atmospheres containing aromatic compounds including styrene, methylstyrene, o-cresol, and nitrocresol. Since many aromatic compounds absorb light at approx. 254 nm, methods other than UV photometry should be employed to measure ozone in atmospheres containing these aromatics.
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