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Titolo:
Influence of NO2 on S(IV) oxidation in aqueous suspensions of aerosol particles from two different origins
Autore:
Tursic, J; Grgic, I;
Indirizzi:
Natl Inst Chem, SI-1000 Ljubljana, Slovenia Natl Inst Chem Ljubljana Slovenia SI-1000 m, SI-1000 Ljubljana, Slovenia
Titolo Testata:
ATMOSPHERIC ENVIRONMENT
fascicolo: 22, volume: 35, anno: 2001,
pagine: 3897 - 3904
SICI:
1352-2310(200108)35:22<3897:IONOSO>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROGEN-DIOXIDE; CATALYZED OXIDATION; BISULFITE SOLUTIONS; ATMOSPHERIC WATER; SULFUR(IV) OXIDES; IRON; CLOUDS; AUTOXIDATION; CHEMISTRY; MECHANISM;
Keywords:
aerosols; transition metals; organic compounds; S(IV) oxidation; NO2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Grgic, I Natl Inst Chem, Hajdrihova 19,POB 3430, SI-1000 Ljubljana, Slovenia Natl Inst Chem Hajdrihova 19,POB 3430 Ljubljana Slovenia SI-1000
Citazione:
J. Tursic e I. Grgic, "Influence of NO2 on S(IV) oxidation in aqueous suspensions of aerosol particles from two different origins", ATMOS ENVIR, 35(22), 2001, pp. 3897-3904

Abstract

The influence of soluble compounds leached from real atmospheric aerosol particles (size range D-ae: 0.17-1.6 mum) and dissolved NO2 on S(IV) oxidation in aqueous solution is presented. Experiments were conducted with aerosol particles of two different origins (i.e., urban and industrial) and at concentrations of trace gases in the gas mixtures (SO2/air and SO2/NO2/air) typical for a polluted atmosphere. During the introduction Of SO2/air into the aqueous aerosol suspensions under dark conditions at pH 4, the formationof SO42- was very slow with a long induction period. However, in the presence of NO2 the oxidation rate of dissolved SO2 in suspensions of aerosols from both origins increased substantially (about 10 times). The results suggest that soluble compounds eluted from atmospheric aerosols have not only acatalytic (e.g. Fe, Mn), but also a pronounced inhibiting effect (e.g., oxalate, formate, acetate, glycolate) on S(IV) autoxidation. When NO2 was also introduced into the aerosol suspensions, the inhibition was not so highlyexpressed. An explanation for this is that the radical chain mechanism is mainly initiated by the interaction of dissolved NO2 and HSO3-. Therefore, at conditions typical for a polluted atmosphere dissolved NO2 can have a significant influence on the secondary formation of SO-42. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 07:40:58