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

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Publikace nespadá pod Filozofickou fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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KURKOVÁ Romana RAY Debajyoti NACHTIGALLOVÁ Dana KLÁN Petr

Rok publikování 2011
Druh Článek v odborném periodiku
Časopis / Zdroj Environmental Science & Technology
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Doi http://dx.doi.org/10.1021/es104095g
Obor Organická chemie
Klíčová slova Photochemistry; ice; snow; dibenzyl ketone
Popis The utilization of artificial snow for environmentally relevant (photo)chemical studies was systematically investigated. Contaminated snow samples were prepared by various methods: by shock freezing of the aqueous solutions sprayed into liquid nitrogen or inside a large walk-in cold chamber at –35 oC, or by adsorption of gaseous contaminants on the surface of artificially prepared pure or natural urban snow. The specific surface area of artificial snow grains produced in liquid nitrogen was determined using adsorption of valerophenone (400–440 cm2 g–1) in order to estimate the surface coverage by small hydrophobic organic contaminants. The dynamics of recombination/dissociation (cage effect) of benzyl radical pairs, photochemically produced from 4-methyldibenzyl ketone on the snow surface, was investigated. The initial ketone loading, c = 10(-6)–10(–8) mol kg(–1), only about 1–2 orders of magnitude higher than the contaminant concentrations commonly found in nature, was already well below monocoverage.
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