Author/Authors :
Pio، نويسنده , , Casimiro and Mirante، نويسنده , , Fلtima and Oliveira، نويسنده , , Mauro Cesar and Matos، نويسنده , , Manuel and Caseiro، نويسنده , , Alexandre and Oliveira، نويسنده , , Cristina and Querol، نويسنده , , Xavier and Alves، نويسنده , , Célia Regina Martins Delgado، نويسنده , , Natércia and Cerqueira، نويسنده , , Mلrio and Camُes، نويسنده , , Filomena and Silva، نويسنده , , Hugo and Plana، نويسنده , , Feliciano، نويسنده ,
Abstract :
An atmospheric aerosol study was performed in 2008 inside an urban road tunnel, in Lisbon, Portugal. Using a high volume impactor, the aerosol was collected into four size fractions (PM0.5, PM0.5–1, PM1–2.5 and PM2.5–10) and analysed for particle mass (PM), organic and elemental carbon (OC and EC), polycyclic aromatic hydrocarbons (PAH), soluble inorganic ions and elemental composition. Three main groups of compounds were discriminated in the tunnel aerosol: carbonaceous, soil component and vehicle mechanical wear. Measurements indicate that Cu can be a good tracer for wear emissions of road traffic. Cu levels correlate strongly with Fe, Mn, Sn and Cr, showing a highly linear constant ratio in all size ranges, suggesting a unique origin through sizes. Ratios of Cu with other elements can be used to source apportion the trace elements present in urban atmospheres, mainly on what concerns coarse aerosol particles.
Keywords :
Road vehicle aerosol emissions , carbonaceous aerosol , Soluble ions , Trace elements , Road tunnel experiments , Aerosol size segregated composition
