Počet záznamů: 1

Chemistry of Small Organic Molecules on Snow Grains: The Applicability of Artificial Snow for Environmental Studies

  1. 1.
    0364650 - UOCHB-X 2012 RIV US eng J - Článek v odborném periodiku
    Kurková, R. - Ray, D. - Nachtigallová, Dana - Klán, P.
    Chemistry of Small Organic Molecules on Snow Grains: The Applicability of Artificial Snow for Environmental Studies.
    Environmental Science and Technology. Roč. 45, č. 8 (2011), s. 3430-3436 ISSN 0013-936X
    Grant CEP: GA MŠk LC512
    Grant ostatní: GA ČR(CZ) GAP503/10/0947
    Výzkumný záměr: CEZ:AV0Z40550506
    Klíčová slova: water-ice * photochemical decomposition * dibenzyl-ketones
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 5.228, rok: 2011

    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.
    Trvalý link: http://hdl.handle.net/11104/0200081