Peroxyacetyl nitrate and

Photolytic. Synthetic air containing gaseous nitrous acid and exposed to artificial sunlight (A, = 300-450 nm) photooxidized 2-butanone into peroxyacetyl nitrate and methyl nitrate (Cox et al., 1980). They reported a rate constant of 2.6 x 10 cm /molecule-sec for the reaction of gaseous 2-butane with OH radicals based on a value of 8 x 10 cm /molecule-sec for the reaction of ethylene with OH radicals. 

The OH radical-initiated photooxidation of 2-butanone in a smog chamber produced peroxyacetyl nitrate and acetaldehyde (Cox et al., 1981). Reported rate constants for the reaction of 2-butanone with OH radicals in the atmosphere and in water are 1.15 x lO and 1.50 x 10 cmVmolecule-sec, respectively (Wallington and Kurylo, 1987 Wallington et al, 1988a). The rate constant for the reaction of 2-butanone and OH radicals in the atmosphere at 300 K is 2.0 x 10 cmVmolecule-sec (Hendry and Kenley, 1979). Cox et al. (1981) reported a photooxidation half-life of 2.3 d for the reaction of 2-butanone and OH radicals in the atmosphere. 

Gaffney, J. S., N. A. Marley, and P. V. Doskey, Peroxyacetyl Nitrate and Hydrocarbon Measurements in Mexico City, Invited Paper, Special Session on Mexico City Air Quality, Spring Meeting of the American Geophysical Union (AGU), Boston, Massachusetts, May 25-28, 1998, Atmos. Environ., in press (1999). 

Grosjean, E D. Grosjean, M. P. Fraser, and G. R. Cass, Air Quality Model Evaluation Data for Organics. 3. Peroxyacetyl Nitrate and Peroxypropionyl Nitrate in Los Angeles Air, Environ. Sci. Technol., 30, 2704-2714 (1996b). 

Peroxyacetyl nitrate and higher saturated PANs PAN formation affected by the lumped ... 

Among the very important secondary pollutants related to smog are the peroxy-nitro compounds, PAN (peroxyacetyl nitrate) and PBN (peroxyben-zylnitrate), which are responsible for the phenomenon of eye redness in polluted cities. Ozone— as well as these organic peroxides—is part of the end of the chain mechanisms of photochemical smog. Considering acetaldehyde as the initial organic reactant we have ... 

Stockwell, W.R., J.B. Milford, D. Gao and Y.J. Yang The effect of acetyl peroxy-peroxy radical reactions on peroxyacetyl nitrate and ozone concentrations, Atmos. Environ. 29 (1995) 1591-1599. 

Attention has been given to possible adverse effects of incorporating f-butyl methyl ether into automobile fuels, and it has been shown that photolysis of f-butyl formate (that is an established product of photolysis) in the presence of NO can produce the relatively stable f-butoxyformyl peroxynitrate. This has a stability comparable to that of peroxyacetyl nitrate and may therefore increase the potential for disseminating NOx (Kirchner et al. 1997). 

N2Os plays an important role in both stratospheric and tropospheric chemistry. The CH3C(0)02N02 molecule, namely, peroxyacetyl nitrate and abbreviated PAN, is influential in tropospheric chemistry. We will study the chemistry of these two species in Chapters 5 and 6. 

The main photochemical pollutants are ozone, nitrogen oxides, aldehydes, carbon monoxide, peroxyacetyl nitrates and hydrocarbons. They are of inter-... 

The major products were ethyl formate and formaldehyde and the minor products were ethyl acetate, acetaldehyde, peroxyacetyl nitrate, and methyl and ethyl nitrates. The products arise from the decomposition reactions of the 1-ethoxyethoxy radical and from its reaction with molecular oxygen ... 

Peroxyacetyl nitrate and related compounds containing the -C(0)00N02 moiety, such as peroxybenzoyl nitrate (PBN),... 

Grosjean (1984) has studied the photooxidation of o-cresol in sunlight-irradiated air-NOx mixtures and found a first order loss of o-cresol (k 1.5 x 10 " s ), a slow generation of ozone, significant loss of NO, and formation of nitrocresols, pyruvic acid, acetaldehyde, formaldehyde, peroxyacetyl nitrate, and various particulate nitro-aromatic products. However, it is not clear to what extent the photolysis of the o—cresol was responsible for this observed chemistry, since very little absorption of tropospheric sunlight is expected for the o-cresol, and NO3 radical chemistry may have been dominant. See the following section. 

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