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Titolo: Uptake and reaction of HOI and IONO2 on frozen and dry NaCl/NaBr surfaces and H2SO4
Autore: Holmes, NS; Adams, JW; Crowley, JN;
- Indirizzi:
- Max Planck Inst Chem, Div Atmospher Chem, D-55020 Mainz, Germany Max Planck Inst Chem Mainz Germany D-55020 Chem, D-55020 Mainz, Germany
- Titolo Testata:
- PHYSICAL CHEMISTRY CHEMICAL PHYSICS
fascicolo: 9,
volume: 3,
anno: 2001,
pagine: 1679 - 1687
- SICI:
- 1463-9076(2001)3:9<1679:UAROHA>2.0.ZU;2-Q
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- MARINE BOUNDARY-LAYER; SEA-SALT PARTICLES; OZONE DEPLETION EVENTS; ALKYL IODIDES; HETEROGENEOUS KINETICS; VOLATILE ORGANOIODINE; MOLECULAR CHLORINE; MODEL-CALCULATIONS; IODINE CHEMISTRY; ATLANTIC-OCEAN;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 50
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Holmes, NS Max Planck Inst Chem, Div Atmospher Chem, Postfach 3060, D-55020 Mainz, Germany Max Planck Inst Chem Postfach 3060 Mainz Germany D-55020 rmany
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- Citazione:
- N.S. Holmes et al., "Uptake and reaction of HOI and IONO2 on frozen and dry NaCl/NaBr surfaces and H2SO4", PHYS CHEM P, 3(9), 2001, pp. 1679-1687
Abstract
The uptake and reaction of HOI and IONO2 with dry and frozen NaCl/NaBr salt surfaces was investigated using a coated-wall flow tube reactor coupled to a mass spectrometer for gas-phase analysis. HOI and IONO2 react with bothsurfaces to form the di-halogens IBr and ICl, which are released into the gas phase. On mixed Cl-/Br- surfaces in which the concentration of Cl- greatly exceeds that of Br-, both HOI and IONO2 react to form ICl or IBr. ICl reacts further with Br- to form the observed gas-phase product, IBr. Formation and release of ICl is only observed once the Br- concentration has been chemically depleted. The sum of IBr+ICl in the gas phase was found to remain constant during the reaction, and to account for all of the HOI/IONO2 taken up, indicating no loss of iodine to the surface, and a catalytic role ofiodine in the activation and release of bromine and chlorine from mixed salt surfaces. The uptake coefficient of HOI on a frozen, mixed salt surface of similar composition to sea-water at 243 K was > 10(-2). Similar results (gamma > 10(-2)) were obtained for the uptake of HOI onto dry, mixed salt surfaces of similar composition at 298 and 243 K. Lower limits for the accommodation coefficient of HOI on frozen salt (243 K), dry salt (253 K) and H2SO4 (253 K) of 0.05, 0.12 and 0.3, respectively were obtained. The implications of these results for tropospheric halogen chemistry are briefly discussed.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/05/13 alle ore 12:13:21