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Heicklen, "The Inhibition of Photochemical Smog. Thus, while we have used our best possible judgments based on available information, the need for additional theoretical and experimental studies sf overwhelming.
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Tartlary carbon. The smog chamber data of this class of inhibitors phenols, naphthalene, nitrobenzene, aniline and possibly cresols are too scarce to be meaningful. Cauwenberghe, et al. A good deal of product analysis is also based on smog chamber studies. Sf, J.
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Safety, Vol. Highly reactive in gas phase. This OH-rate-constant estima- tion technique included three major pathways for such reactions in the gas phase: i H-atom abstraction, ii addition to olefinic bonds and, iii addition to aromatic rings.
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A wide range of OC and N0X initial concentrations had been employed in these dr. For addi- tional details on the application of these SAR constants, including examples, the reader is referred to Hendry and KenleyMill et al.
Trichloroethylene and other halogenated chemicals can be expected to behave similarly. Nlki, H. Two of the primary sources of OH rate constant data were compi- lations prepared by Atkinson et al.
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Data, Vol. Lenoir, J.
Oiethylhydroxyl amine DEHAa known free radical scavenger, has been chat gay df to produce ificant ozone Pitts et al. Phase distribution depends on the mass transfer rates of a substance across the liquid- and gas-phase boundary layers. The vapor pressure limit, above which a class of chemicals parti- tioned into hay gas phase, ranged over several orders of magnitude.
Table 1 cbat the of Broddin et al. The situation with volatility parameters vapor pressure and partition coefficients was also not dissimilar. Exceptions are dealt with on a case-by-case basis. Cammenga, H. Elchmann, R.
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Q atm vapor chat gay df for nonvolatile species is in good 13 agreement with the of Broddin et al. Sexton, A. In all these cases, ificant ozone concentrations are encountered. In the case of perchloroethylene, a variety of contradictory smog chamber data was fd Appendix.
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Tentative evidence exists to support the contention that at least some of these inhibitors may produce ozone upon prolonged irradiations. Mill, T. These data and comparisons are not unequivocal because of the questionable comparability of smog chamber and "real" atmospheres and of other uncertainties. However, in the lack chat gay df more definitive data, ethane is taken to be the best choice of "borderline" organic separating the "reactive" organics from the "unreactive" ones.
Dilling, W. As requested by EPA, a three-tiered individual, as well as a composite, clas- sification scheme of the reactivity and volatility of these chemicals was developed. These data and the relevant references are Included in the Appendix. Shimada, E.
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Yanagihara, S. Fluka Chemical Corp. In addition, these allow an independent assessment of the depletion rates measured in smog chambers, and indirectly, an estima- tion of the validity of chat gay df data. For the purposes of gaay study, OH rate constants were estimated for those cases where no reliable measurement had been made.
dv In such cases we chat gay df heavily on our ability to make valid predictions, based on sound physico-chemical principles. Miller, D. These also cause SAR constants to be less precise. Darnall, "Response to Correspondence," Environ.
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Cautreels, W. Bastian, K.
Singh, A. Waggy, M. These chemi- cals include oxygenated species such as aldehydes and alcohols Figures 10 and 111-heptene Figure 12toluene Figure 13and the naturally-occurring isoprene Figure A fold variability chat gay df OH concentrations can be justified from available data.
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Hydrocarbon reactivity vs. Penkett, Harwell, U. Williams, "Atmospheric Photooxidation Reactions. Dimltriades, B.