8 documents found, page 1 of 1
Source apportionment of PM2.5 and PM10 by Ionic and Mass Balance (IMB) in a tra...
Pio, C.; Alves, C.; Nunes, T.; Cerqueira, M.; Lucarelli, F.; Nava, S.; Calzolai, G.; Gianelle, V.; Colombi, C.; Amato, F.; Karanasiou, A.; Querol, X.The recently developed Ion and Mass Balance (IMB) source apportionment methodology was applied to a traffic influenced urban aerosol, permitting the quantification of the contributions of 11 source components, or formation processes, which accounted for more than 96% of the measured aerosol mass loading. Main sources included exhaust and non-exhaust road vehicle emissions, biomass burning, secondary inorganic a...
Physical and chemical properties of non-exhaust particles generated from wear b...
Alves, C. A.; Vicente, A. M. P.; Calvo, A. I.; Baumgardner, D.; Amato, F.; Querol, X.; Pio, C.; Gustafsson, M.A road simulator was used to generate wear particles from the interaction between two tyre brands and a composite pavement. Particle size distributions were monitored using a scanning mobility particle sizer and an aerosol particle sizer. Continuous measurements of particle mass concentrations were also made. Collection of inhalable particles (PM10) was conducted using a high-volume sampler equipped with quartz...
An intercomparison study of analytical methods used for quantification of levog...
Yttri, K. E.; Schnelle-Kreis, J.; Maenhaut, W.; Abbaszade, G.; Alves, C.; Bjerke, A.; Bonnier, N.; Bossi, R.; Claeys, M.; Dye, C.; Evtyugina, M.The monosaccharide anhydrides (MAs) levoglucosan, galactosan and mannosan are products of incomplete combustion and pyrolysis of cellulose and hemicelluloses, and are found to be major constituents of biomass burning (BB) aerosol particles. Hence, ambient aerosol particle concentrations of levoglucosan are commonly used to study the influence of residential wood burning, agricultural waste burning and wildfire ...
The application of a multi-wavelength aethalometer to estimate iron dust and bl...
Fialho, P.; Cerqueira, M.; Pio, C.; Cardoso, J.; Nunes, T.; Custódio, D.; Alves, C.; Almeida, S. M.; Almeida-Silva, M.; Reis, M.; Rocha, F.The two-component model (Fialho etal., 2006) was used to decouple the contributions of black carbon (BC) and iron oxides, present in dust, to the aerosol attenuation coefficient, measured with a multi-wavelength Aethalometer. The model results were compared with the elemental carbon (EC) and iron concentrations determined in the laboratory from the analysis of aerosol particles collected with conventional sampl...
Diversity and seasonal dynamics of airborne archaea
Fröhlich-Nowoisky, J.; Ruzene Nespoli, C.; Pickersgil, D. A.; Galand, P. E.; Müller-Germann, I.; Nunes, T.; Gomes Cardoso, J.; Almeida, S. M.; Pio, C.Archaea are widespread and abundant in many terrestrial and aquatic environments, and are thus outside extreme environments, accounting for up to 10% of the prokaryotes. Compared to bacteria and other microorganisms, however, very little is known about the abundance, diversity, and dispersal of archaea in the atmosphere. By means of DNA analysis and Sanger sequencing targeting the 16S rRNA (435 sequences) and a...
Variability of carbonaceous aerosols in remote, rural, urban and industrial env...
Querol, X.; Alastuey, A.; Viana, M.; Moreno, T.; Reche, C.; Minguillón, M. C.; Ripoll, A.; Pandolfi, M.; Amato, F.; Karanasiou, A.; Pérez, N.; Pey, J.We interpret here the variability of levels of carbonaceous aerosols based on a 12 yr database from 78 monitoring stations across Spain specially compiled for this article. Data did not evidence any spatial trends of carbonaceous aerosols across the country. Conversely, results show marked differences in average concentrations from the cleanest, most remote sites (around 1 μg m-3 of non-mineral carbon (nmC), mo...
Mutagenicity assessment of aerosols in emissions from wood combustion in Portugal
Vu, B.; Alves, C. A.; Gonçalves, C.; Pio, C.; Gonçalves, F.; Pereira, R.Polycyclic aromatic hydrocarbon (PAH) extracts of fine particles (PM(2.5)) collected from combustion of seven wood species and briquettes were tested for mutagenic activities using Ames test with Salmonella typhimurium TA98 and TA100. The woods were Pinus pinaster (maritime pine), Eucalyptus globulus (eucalypt), Quercus suber (cork oak), Acacia longifolia (golden wattle), Quercus faginea (Portuguese oak), Olea ...
General overview: European Integrated project on Aerosol Cloud Climate and Air ...
Kulmala, M.; Asmi, A.; Lappalainen, H. K.; Baltensperger, U.; Brenguier, J. L.; Facchini, M. C.; Hansson, H. C.; Hov, Ø.; O'Dowd, C. D.; Pöschl, U.In this paper we describe and summarize the main achievements of the European Aerosol Cloud Climate and Air Quality Interactions project (EUCAARI). EUCAARI started on 1 January 2007 and ended on 31 December 2010 leaving a rich legacy including: (a) a comprehensive database with a year of observations of the physical, chemical and optical properties of aerosol particles over Europe, (b) comprehensive aerosol mea...