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Chemistry of Small Organic Molecules on Snow Grains: The Applicability of Artificial Snow for Environmental Studies
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SYSNO ASEP 0364650 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Chemistry of Small Organic Molecules on Snow Grains: The Applicability of Artificial Snow for Environmental Studies Author(s) Kurková, R. (CZ)
Ray, D. (CZ)
Nachtigallová, Dana (UOCHB-X) RID, ORCID
Klán, P. (CZ)Number of authors 4 Source Title Environmental Science and Technology - ISSN 0013-936X
Roč. 45, č. 8 (2011), s. 3430-3436Number of pages 7 s. Language eng - English Country US - United States Keywords water-ice ; photochemical decomposition ; dibenzyl-ketones Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects LC512 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z40550506 - UOCHB-X (2005-2011) UT WOS 000289341300035 DOI 10.1021/es104095g Annotation The utilization of artificial snow for environmentally relevant (photo)chemical studies was systematically investigated. The SSA of artificial snow grains produced in liquid nitrogen was determined using valerophenone photochemistry to estimate the surface coverage by small hydrophobic contaminants. The initial ketone loading, only about 1−2 orders of magnitude higher than the contaminant concentrations found in nature, was already well below monolayer coverage. We found that the efficiency of out-of-cage reactions decreased at much higher temperatures than those for frozen solutions; however, the cage effect was essentially the same no matter what technique of snow production or ketone deposition/uptake was used. The experimental observation that the contaminant molecules are initially self-associated even at the lowest concentrations was supported by DFT calculations. Workplace Institute of Organic Chemistry and Biochemistry Contact asep@uochb.cas.cz ; Kateřina Šperková, Tel.: 232 002 584 ; Jana Procházková, Tel.: 220 183 418 Year of Publishing 2012
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