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Titolo:
Experimental determination of reactive oxygen species in Taipei aerosols
Autore:
Hung, HF; Wang, CS;
Indirizzi:
Natl Taiwan Univ, Grad Inst Environm Hlth, Taipei 10764, Taiwan Natl Taiwan Univ Taipei Taiwan 10764 Environm Hlth, Taipei 10764, Taiwan Natl Taiwan Univ, Dept Publ Hlth, Taipei 10764, Taiwan Natl Taiwan Univ Taipei Taiwan 10764 ept Publ Hlth, Taipei 10764, Taiwan Natl Taiwan Univ, Grad Inst Occupat Med & Ind Hyg, Taipei 10764, Taiwan Natl Taiwan Univ Taipei Taiwan 10764 Med & Ind Hyg, Taipei 10764, Taiwan
Titolo Testata:
JOURNAL OF AEROSOL SCIENCE
fascicolo: 10, volume: 32, anno: 2001,
pagine: 1201 - 1211
SICI:
0021-8502(200110)32:10<1201:EDOROS>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYDROGEN-PEROXIDE; FREE-RADICALS; POTENTIAL ROLE; LUNG INJURY; HYDROPEROXIDES; INFLAMMATION; AIR;
Keywords:
urban aerosol; fine particles; fresh aerosol; aged aerosol;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, CS Natl Taiwan Univ, Grad Inst Environm Hlth, 1,Jen Ai Rd,Sec 1, Taipei 10764, Taiwan Natl Taiwan Univ 1,Jen Ai Rd,Sec 1 Taipei Taiwan 10764 4, Taiwan
Citazione:
H.F. Hung e C.S. Wang, "Experimental determination of reactive oxygen species in Taipei aerosols", J AEROS SCI, 32(10), 2001, pp. 1201-1211

Abstract

The concentrations of reactive oxygen species (ROS) in various particle size fractions were determined for the Taipei aerosols and for particles in vehicular exhausts. Sampling of particles was carried out at a sidewalk and an underpass by a cascade impactor. The sampling duration was 3 h during daytime at the sidewalk and 20-30 min during rush hours in the underpass. Thecollected particles were treated with a non-fluorescent probe dichlorofluorescin (DCFH2) that forms highly fluorescent dichlorofluorescin (DCF) when oxidized in the presence of ROS. Data on the fluorescence intensity of DCF were converted into equivalent hydrogen peroxide concentrations using calibration curves obtained from H2O2 assay. The equivalent H2O2 concentration was used as an indicator for the reactivity of ROS in particles. The concentration of ROS in ambient particles had good correlations with the intensityof photochemical reactions. The correlation coefficient between the ROS concentration and the O-3 concentration was higher for smaller particles. This indicates that the intensity of photochemical reactions is a major factoraffecting ROS concentration in smaller particles, especially in ultrafine particles (aerodynamic diameter <0.18 mum). Moreover, for the same mass concentrations of particles, the content of ROS was found to be higher in smaller particles, except for ultrafine particles. This pattern was observed only in the particles sampled at the sidewalk, and not those in the underpass. The results suggest that, for the same particle mass concentration, smaller particles in ambient aerosols have higher ROS contents and, therefore, may have a greater potential to cause damage to the pulmonary cells. (C) 2001 Elsevier Science Ltd. All rights reserved.

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Documento generato il 14/11/18 alle ore 04:30:54