Atmospheric PM and volatile organic compounds released from Mediterranean shrubland wildfires

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Title: Atmospheric PM and volatile organic compounds released from Mediterranean shrubland wildfires
Authors: García Hurtado, Elisa | Pey, Jorge | Borrás, Esther | Sánchez, Pilar | Vera, Teresa | Carratalá, Adoración | Alastuey, Andrés | Querol, Xavier | Vallejo, V. Ramon
Research Group/s: Recursos Hídricos y Desarrollo Sostenible | Residuos, Pirólisis y Combustión
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química
Keywords: Biomass burning | Mediterranean shrubland | Water soluble ions | Trace elements | Organic compounds | VOCs
Knowledge Area: Tecnologías del Medio Ambiente
Issue Date: 11-Feb-2014
Publisher: Elsevier
Citation: Atmospheric Environment. 2014, Accepted Manuscript, Available online 11 February 2014. doi:10.1016/j.atmosenv.2014.02.016
Abstract: Wildfires produce a significant release of gases and particles affecting climate and air quality. In the Mediterranean region, shrublands significantly contribute to burned areas and may show specific emission profiles. Our objective was to depict and quantify the primary-derived aerosols and precursors of secondary particulate species released during shrubland experimental fires, in which fire-line intensity values were equivalent to those of moderate shrubland wildfires, by using a number of different methodologies for the characterization of organic and inorganic compounds in both gas-phase and particulate-phase. Emissions of PM mass, particle number concentrations and organic and inorganic PMx components during flaming and smouldering phases were characterized in a field shrubland fire experiment. Our results revealed a clear prevalence of K+ and SO42- as inorganic ions released during the flaming-smouldering processes, accounting for 68 to 80% of the inorganic soluble fraction. During the residual-smouldering phases, in addition to K+ and SO42-, Ca2+ was found in significant amounts probably due the predominance of re-suspension processes (ashes and soil dust) over other emission sources during this stage. Concerning organic markers, the chromatograms were dominated by phenols, n-alkanals and n-alkanones, as well as by alcohol biomarkers in all the PMx fractions investigated. Levoglucosan was the most abundant degradation compound with maximum emission factors between 182 and 261 mg kg-1 in PM2.5 and PM10 respectively. However, levoglucosan was also observed in significant amounts in the gas-phase. The most representative organic volatile constituents in the smoke samples were alcohols, carbonyls, acids, monocyclic and bicyclic arenes, isoprenoids and alkanes compounds. The emission factors obtained in this study may contribute to the validation and improvement of national and international emission inventories of this intricate and diffuse emission source.
Sponsor: This study was funded by the FEEDBACKS-PROMETEO Programme (Prometeo 2009/006), and the CONSOLIDER-INGENIO 2010 Programme (GRACCIE, CSD2007-00067). Support for infrastructure projects of scientific and technological co-financed with the European Regional Development Fund (FEDER). The CEAM Foundation is supported by Generalitat Valenciana (GVA).
ISSN: 1352-2310 | 1873-2844 (Online)
DOI: 10.1016/j.atmosenv.2014.02.016
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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Appears in Collections:INV - Recursos Hídricos y Desarrollo Sostenible - Artículos de Revistas
INV - REMAN - Artículos de Revistas

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