Photooxidation of the propylene-NOx-air system studied by long-path Fourier transform infrared spectrometry

Abstract

It would appear that the statistical treatment employed herein is capable of defining the primary sources that contribute to roadway dust and of achieving semiquantitative estimates of those anthropogenic sources of primary environmental significance. The resolving power of the analysis is, however, insufficient to distinguish between sources that produce particulate matter having closely similar physical characteristics. Better definition of test vectors and/or more extensive sample fractionation is suggested as a means of improving resolving power. Quantitative assessment of the major source components is generally poor, and it is clear that analytical data for bulk matrix elements are necessary for improved quantitation.Finally, it must be stressed that, while statistical analysis provides a more detailed and more quantitative description of the data, graphical presentation of the mass and concentration distributions of individual elements in a fractionated particulate sample is frequently more useful in assigning physical significance. It is strongly recommended, therefore, that both interpretive approaches be employed in an interactive configuration. AcknowledgmentWe wish to thank the operating staff of the Illinois Advanced TRIGA Reactor facility for their help in making the irradiations and the Illinois State Geological Survey for access to their counting equipment on which most of the reported analyses were performed.

Formation of nitrous acid and nitric oxide in the heterogeneous dark reaction of nitrogen dioxide and water vapor in a smog chamber

“…The first-order dependence of the reaction rate with respect to NO2 and the absence of HONO:, as a product clearly eliminate the possibility of the gas phase reaction (7). Since HONO2 has been observed by infrared spectrometry in the photochemical runs in our smog chamber [23], it should also be detected in this study if i t were formed in the gas phase. Further, since reaction (-1) has been known [13] to be slow in the parts-per-million concentration range in both the gas and the glass surface phases, the formation mechanism of NO cannot be attributed to the reaction.…”

Gas‐phase chlorine‐initiated photooxidation of methanol and isopropanol

“…HCOOH, 1.21 X loM4 (1105); PAN, 13.9 X lop4 (1160), so far from [7]; and HOzN02, 1.06 X (1304, Q branch peak to valley).l Units are ppm-l-m-l and cm-l for absorption coefficient and wave number, respectively. The accurate measurement of CO and COZ could not be made due to an unidentified formation from the experimental chamber.…”

Mono- and di-carboxylic acids under long-range transport of air pollution in central Japan

“…By photochemical reactions of the gaseous organic pollutants in the atmosphere oxidants and various binds of radicals are formed, which in turn, oxidize the organic species to produce mono-and di-carboxylic acids. It is suggested in smog chamber by Pitts et al (1977), Akimoto et al (1980), Grosjean (l977), Grosjean and Friedlander (1980) and Hatakeyama et al (1985 and. However, few volatile mono-carboxylic acids except for formic acid have been studied in the atmosphere.…”