edu.ucar.opensky::articles:19650 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T02:33:33.867004 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7mc91t3 Formation of highly oxygenated low-volatility products from cresol oxidation 2017-03-10T00:00:00Z publication https://n2t.org/ark:/85065/d7mc91t3 https://doi.org/10.5194/acp-17-3453-2017 Schwantes, Rebecca H. author Schilling, K. A. author McVay, R. C. author Lignell, H. author Coggon, M. M. author Zhang, Xuan author Wennberg, P. O. author Seinfeld, J. H. author UCAR/NCAR - Library publisher Hydroxyl radical (OH) oxidation of toluene produces ring-retaining products: cresol and benzaldehyde, and ring-opening products: bicyclic intermediate compounds and epoxides. Here, first- and later-generation OH oxidation products from cresol and benzaldehyde are identified in laboratory chamber experiments. For benzaldehyde, first- generation ring-retaining products are identified, but later-eneration products are not detected. For cresol, low-volatility (saturation mass concentration, C * similar to 3.5 x 10(4) -7.7 x 10(-3) mu gm(-3)), first- and later-generation ring-retaining products are identified. Subsequent OH addition to the aromatic ring of o-cresol leads to compounds such as hydroxy, dihydroxy, and trihydroxy methyl benzoquinones and dihydroxy, trihydroxy, tetrahydroxy, and pentahydroxy toluenes. These products are detected in the gas phase by chemical ionization mass spectrometry (CIMS) and in the particle phase using offline direct analysis in real-time mass spectrometry (DART-MS). Our data suggest that the yield of trihydroxy toluene from dihydroxy toluene is substantial. While an exact yield cannot be reported as authentic standards are unavailable, we find that a yield for trihydroxy toluene from dihydroxy toluene of similar to 0.7 (equal to the reported yield of dihydroxy toluene from o-cresol (Olariu et al., idation under low-NO conditions. These results suggest that even though the cresol pathway accounts for only similar to 20% of the oxidation products of toluene, it is the source of a significant fraction (similar to 20-40 %) of toluene secondary organic aerosol (SOA) due to the formation of low- volatility products. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. None eng geoscientificInformation