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dc.contributor.authorNie Wei
dc.contributor.authorHong Juan
dc.contributor.authorHäme Silja A K
dc.contributor.authorAijun Ding
dc.contributor.authorLi Yugen
dc.contributor.authorYan Chao
dc.contributor.authorHao Liqing
dc.contributor.authorMikkilä Jyri
dc.contributor.authorZheng Longfei
dc.contributor.authorXie Yuning
dc.contributor.authorZhu Caijun
dc.contributor.authorXu Zheng
dc.contributor.authorChi Xuguang
dc.contributor.authorHuang Xin
dc.contributor.authorZhou Yang
dc.contributor.authorLin Peng
dc.contributor.authorVirtanen Annele
dc.contributor.authorWorsnop Douglas R
dc.contributor.authorKulmala Markku
dc.contributor.authorEhn Mikael
dc.contributor.authorYu Jianzhen
dc.contributor.authorKerminen Veli-Matti
dc.contributor.authorPetäjä Tuukka
dc.date.accessioned2017-04-26T10:57:39Z
dc.date.available2017-04-26T10:57:39Z
dc.date.issued2017
dc.identifier10.5194/acp-17-3659-2017fi_FI
dc.identifier.issn1680-7316
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/2141
dc.descriptionArticle
dc.description.abstractThe volatility of organic aerosols remains poorly understood due to the complexity of speciation and multiphase processes. In this study, we extracted humic-like substances (HULIS) from four atmospheric aerosol samples collected at the SORPES station in Nanjing, eastern China, and investigated the volatility behavior of particles at different sizes using a Volatility Tandem Differential Mobility Analyzer (VTDMA). In spite of the large differences in particle mass concentrations, the extracted HULIS from the four samples all revealed very high-oxidation states (O : C > 0.95), indicating secondary formation as the major source of HULIS in Yangtze River Delta (YRD). An overall low volatility was identified for the extracted HULIS, with the volume fraction remaining (VFR) higher than 55 % for all the regenerated HULIS particles at the temperature of 280 °C. A kinetic mass transfer model was applied to the thermodenuder (TD) data to interpret the observed evaporation pattern of HULIS, and to derive the mass fractions of semi-volatile (SVOC), low-volatility (LVOC) and extremely low-volatility components (ELVOC). The results showed that LVOC and ELVOC dominated (more than 80 %) the total volume of HULIS. Atomizing processes led to a size-dependent evaporation of regenerated HULIS particles, and resulted in more ELVOC in smaller particles. In order to understand the role of interaction between inorganic salts and atmospheric organic mixtures in the volatility of an organic aerosol, the evaporation of mixed samples of ammonium sulfate (AS) and HULIS was measured. The results showed a significant but nonlinear influence of ammonium sulfate on the volatility of HULIS. The estimated fraction of ELVOC in the organic part of the largest particles (145 nm) increased from 26 %, in pure HULIS samples, to 93 % in 1 : 3 (mass ratio of HULIS : AS) mixed samples, to 45 % in 2 : 2 mixed samples, and to 70 % in 3 : 1 mixed samples, suggesting that the interaction with ammonium sulfate tends to decrease the volatility of atmospheric organic compounds. Our results demonstrate that HULIS are important low-volatility, or even extremely low-volatility, compounds in the organic-aerosol phase. As important formation pathways of atmospheric HULIS, multiphase processes, including oxidation, oligomerization, polymerization and interaction with inorganic salts, are indicated to be important sources of low-volatility and extremely low-volatility species of organic aerosols.fi_FI
dc.language.isoENfi_FI
dc.publisherCopernicus Publications on behalf of the European Geosciences Unionfi_FI
dc.relation.ispartofseriesATMOSPHERIC CHEMISTRY AND PHYSICS
dc.relation.urihttp://www.atmos-chem-phys.net/17/3659/2017/acp-17-3659-2017-discussion.htmlfi_FI
dc.rightsCC BY https://creativecommons.org/licenses/by/3.0/
dc.titleVolatility of mixed atmospheric humic-like substances and ammonium sulfate particlesfi_FI
dc.typehttp://purl.org/eprint/type/JournalArticle
dc.description.versionPublisher's pdffi_FI
dc.contributor.departmentDepartment of Applied Physics, activities
uef.solecris.id46601912
eprint.statushttp://purl.org/eprint/status/PeerReviewedfi_FI
dc.type.publicationinfo:eu-repo/semantics/article
dc.rights.accessrights© The Authors
uef.citationinfo.issue17(5)
uef.citationinfo.pages3659-3672
dc.relation.doi10.5194/acp-17-3659-2017
dc.description.reviewstatushttp://purl.org/eprint/status/PeerReviewed
dc.format.pagerange3659-3672
dc.relation.issn1680-7316
dc.relation.issue17(5)
dc.rights.accesslevelopenAccess


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