Título: Air Pollution XV Pesquisar Publicações da Ata de Conferência

Páginas: 59-68

15th International Conference on Modelling, Monitoring and Management of Air Pollution

Algarve, Portugal, April 23-25, 2007

ISI Proceedings

ISI Web of Knowledge - 2 Citações

Scopus - 0 Citações

FOS: Ciências exactas e naturais > Ciências da terra e ciências do ambiente

CORDIS: Ciências Naturais > Ciências do ambiente

ID Authenticus: P-004-CD2

DOI: 10.2495/air070061

Abstract (EN): The aim of this work was to study the influence of traffic emissions on the physical and chemical characteristics of PM10 and PM2.5, namely considering: concentration, size distribution and elemental composition. Four monitoring sites in the north of Portugal were selected: two sites directly influenced by traffic emissions and two rural background sites. PM10 and PM2.5 samples were collected using low-volume samplers; the element analyses were performed by particle induced X-ray emission (PIXE). At the sites influenced by traffic emissions PM10 and PM2.5 concentrations were 7-9 and 6-7 times higher than at the background sites. The presence of 17 elements (Mg, Al, Si, P, S, Cl, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn and Pb) was determined in both PM fractions; particle metal contents were 3-44 and 3-27 times higher for PM10 and PM2.5, respectively, than at the backgrounds sites. The results also showed that in coastal areas sea salt sprays are important sources of particles, influencing PM concentration and distributions (PM10 increased by 46%, PM2.5/PM10 decreased by 26%), as well as PM compositions (Cl in PM10 was 11 times higher).

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10