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Indoor ozone/human ...
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Salvador, Christian Mark,1989Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology
(author)
Indoor ozone/human chemistry and ventilation strategies
- Article/chapterEnglish2019
Publisher, publication year, extent ...
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2019-09-15
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Hindawi Limited,2019
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electronicrdacarrier
Numbers
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LIBRIS-ID:oai:research.chalmers.se:badc303f-4304-4fec-bfb9-7bfcd12eab20
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https://research.chalmers.se/publication/512859URI
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https://doi.org/10.1111/ina.12594DOI
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https://gup.ub.gu.se/publication/283889URI
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https://urn.kb.se/resolve?urn=urn:nbn:se:ivl:diva-3351URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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A-rapport, A2442
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This study aimed to better understand and quantify the influence of ventilation strategies on occupant-related indoor air chemistry. The oxidation of human skin oil constituents was studied in a continuously ventilated climate chamber at two air exchange rates (1 h-1 and 3 h-1 ) and two initial ozone mixing ratios (30 and 60 ppb). Additional measurements were performed to investigate the effect of intermittent ventilation ("off" followed by "on"). Soiled t-shirts were used to simulate the presence of occupants. A time-of-flight-chemical ionization mass spectrometer (ToF-CIMS) in positive mode using protonated water clusters was used to measure the oxygenated reaction products geranyl acetone, 6-methyl-5-hepten-2-one (6-MHO) and 4-oxopentanal (4-OPA). The measurement data were used in a series of mass balance models accounting for formation and removal processes. Reactions of ozone with squalene occurring on the surface of the t-shirts are mass transport limited; ventilation rate has only a small effect on this surface chemistry. Ozone-squalene reactions on the t-shirts produced gas-phase geranyl acetone, which was subsequently removed almost equally by ventilation and further reaction with ozone. About 70% of gas-phase 6-MHO was produced in surface reactions on the t-shirts, the remainder in secondary gas-phase reactions of ozone with geranyl acetone. 6-MHO was primarily removed by ventilation, while further reaction with ozone was responsible for about a third of its removal. 4-OPA was formed primarily on the surfaces of the shirts (~60%); gas-phase reactions of ozone with geranyl acetone and 6-MHO accounted for ~30% and ~10%, respectively. 4-OPA was removed entirely by ventilation. The results from the intermittent ventilation scenarios showed delayed formation of the reaction products and lower product concentrations compared to continuous ventilation.
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Beko, G.Danmarks Tekniske Universitet,Technical University of Denmark
(author)
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Weschler, Charles J.Rutgers University,Danmarks Tekniske Universitet,Technical University of Denmark
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Morrison, GlennThe University of North Carolina,The University of North Carolina System
(author)
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Le Breton, Michael,1986Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology(Swepub:gu)xlebrm
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Hallquist, Mattias,1969Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology(Swepub:gu)xhamat
(author)
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Ekberg, Lars,1962Chalmers tekniska högskola,Chalmers University of Technology,CIT Energy management AB(Swepub:cth)le
(author)
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Langer, Sarka,1960IVL Svenska Miljöinstitutet(Swepub:ivl)P010239
(author)
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Göteborgs universitetInstitutionen för kemi och molekylärbiologi
(creator_code:org_t)
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In:Indoor Air: Hindawi Limited29:6, s. 913-9251600-06680905-6947
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Indoor Air
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Chalmers University of Technology
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University of Gothenburg
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