Determination of the Specific Surface Area of Snow Using Ozonation of 1,1-Diphenylethylene

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F11%3A00050349" target="_blank" >RIV/00216224:14310/11:00050349 - isvavai.cz</a>

Výsledek na webu

<a href="http://pubs.acs.org/doi/abs/10.1021/es202922k" target="_blank" >http://pubs.acs.org/doi/abs/10.1021/es202922k</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/es202922k" target="_blank" >10.1021/es202922k</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Determination of the Specific Surface Area of Snow Using Ozonation of 1,1-Diphenylethylene

Popis výsledku v původním jazyce

We measured the kinetics of ozonation reaction of 1,1-diphenylethylene (DPE) in artificial snow, produced by shock freezing of DPE aqueous solutions sprayed into liquid nitrogen. It was demonstrated that most of the reactant molecules are in direct (productive) contact with gaseous ozone, thus the technique produces snow with organic molecules largely ejected to the surface of snow grains. The kinetic data were used to evaluate the snow specific surface area (70 cm2 g?1). This number is a measure of theavailability of the molecules on the surface for chemical reaction with gaseous species. The results are consistent with the Langmuir?Hinshelwood type reaction mechanism. For typical atmospheric ozone concentrations in polar areas (20 ppbv), the estimated half-life of DPE, representing environmentally relevant compounds such as alkenes on the surface of snow grains is 5 days at sub-monolayer coverages and ?15 oC.

Název v anglickém jazyce

Determination of the Specific Surface Area of Snow Using Ozonation of 1,1-Diphenylethylene

Popis výsledku anglicky

We measured the kinetics of ozonation reaction of 1,1-diphenylethylene (DPE) in artificial snow, produced by shock freezing of DPE aqueous solutions sprayed into liquid nitrogen. It was demonstrated that most of the reactant molecules are in direct (productive) contact with gaseous ozone, thus the technique produces snow with organic molecules largely ejected to the surface of snow grains. The kinetic data were used to evaluate the snow specific surface area (70 cm2 g?1). This number is a measure of theavailability of the molecules on the surface for chemical reaction with gaseous species. The results are consistent with the Langmuir?Hinshelwood type reaction mechanism. For typical atmospheric ozone concentrations in polar areas (20 ppbv), the estimated half-life of DPE, representing environmentally relevant compounds such as alkenes on the surface of snow grains is 5 days at sub-monolayer coverages and ?15 oC.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CC - Organická chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2011

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Environmental Science & Technology

ISSN

0013-936X

e-ISSN

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Svazek periodika

45

Číslo periodika v rámci svazku

23

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

10061-10067

Kód UT WoS článku

000297382700035

EID výsledku v databázi Scopus

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