| Autor: |
Edney, E. O., Driscoll, D. J., Weathers, W. S., Kleindienst, T. E., Conver, T. S., McIver, C. D., Li, W. |
| Předmět: |
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| Zdroj: |
Aerosol Science & Technology; Dec2001, Vol. 35 Issue 6, p998-1008, 11p, 7 Charts, 11 Graphs |
| Abstrakt: |
A laboratory study was carried out to investigate the formation of polyketones in secondary organic aerosol from photooxidation of the aromatic hydrocarbon toluene, a major constituent of automobile exhaust. The laboratory experiments consisted of irradiating toluene/propylene/NO[sub x]/air mixtures in a smog chamber operated in the dynamic mode and collecting submicron secondary organic aerosol samples on Zefluor filters and on stainless steel disks in a low pressure cascade impactor. Carbonyl oxidation products in methanol extracts of the filters were derivatized using O-(2,3,4,5,6,-pentafluorobenzyl)-hydroxylamine, and the oxime derivatives were detected with a positive chemical ionization gas chromatography ion trap mass spectroscopy (GC-ITMS) system. Infrared spectra of the cascade impactor samples were used to determine the chemical functional group concentrations of the aerosol. The results of the GC-ITMS and infrared spectral analyses were consistent with the formation of multifunctional oxygenates, including hydroxy diones as well as triones, tetraones, and pentaones. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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