title: Partitioning of magnetic particles in PM10, PM2.5 and PM1 aerosols in the urban atmosphere of Barcelona (Spain).
abstract: A combined magnetic-chemical study of 15 daily, simultaneous PM10-PM2.5-PM1 urban background aerosol samples has been carried out. The magnetic properties are dominated by non-stoichiometric magnetite, with highest concentrations seen in PM10. Low temperature magnetic analyses showed that the superparamagnetic fraction is more abundant when coarse, multidomain particles are present, confirming that they may occur as an oxidized outer shell around coarser grains. A strong association of the magnetic parameters with a vehicular PM10 source has been identified. Strong correlations found with Cu and Sb suggests that this association is related to brake abrasion emissions rather than exhaust emissions. For PM1 the magnetic remanence parameters are more strongly associated with crustal sources. Two crustal sources are identified in PM1, one of which is of North African origin. The magnetic particles are related to this source and so may be used to distinguish North African dust from other sources in PM1.
authors.affiliation: State Meteorological Agency of Spain (AEMET), c/Leonardo Prieto Castro 8, 28071 Madrid, Spain.
authors.forename: María Aránzazu
authors.initials: MA
authors.lastname: Revuelta
authors.affiliation: Geosciences Institute (IGEO, UCM-CSIC), Geology Faculty, c/ Jose Antonio Navais 2, Ciudad Universitaria, 28040 Madrid, Spain; Department of Earth Physics, Astronomy and Astrophysics I, Physics Faculty, Complutense University of Madrid, Avda Complutense s/n, Ciudad Universitaria, 28040 Madrid, Spain. Electronic address: gregc@fis.ucm.es.
authors.forename: Gregg
authors.initials: G
authors.lastname: McIntosh
authors.affiliation: Institute of Environmental Assessment and Water Research, Spanish Research Council (IDAEA-CSIC), c/Jordi Girona 18-26, 08034 Barcelona, Spain; Currently at Aix-Marseille Université, Laboratoire Chimie Environnement, France.
authors.forename: Jorge
authors.initials: J
authors.lastname: Pey
authors.affiliation: Institute of Environmental Assessment and Water Research, Spanish Research Council (IDAEA-CSIC), c/Jordi Girona 18-26, 08034 Barcelona, Spain.
authors.forename: Noemi
authors.initials: N
authors.lastname: Pérez
authors.affiliation: Institute of Environmental Assessment and Water Research, Spanish Research Council (IDAEA-CSIC), c/Jordi Girona 18-26, 08034 Barcelona, Spain.
authors.forename: Xavier
authors.initials: X
authors.lastname: Querol
authors.affiliation: Institute of Environmental Assessment and Water Research, Spanish Research Council (IDAEA-CSIC), c/Jordi Girona 18-26, 08034 Barcelona, Spain.
authors.forename: Andrés
authors.initials: A
authors.lastname: Alastuey
mesh_terms: D000336:Aerosols / Q000032:analysis*; D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere / Q000737:chemistry; D002947:Cities; D004391:Dust / Q000032:analysis; D004784:Environmental Monitoring; D008280:Magnetics; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis; D013030:Spain; D001335:Vehicle Emissions / Q000032:analysis
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D004391:Dust; D052638:Particulate Matter; D001335:Vehicle Emissions
keywords: Atmospheric aerosol; Environmental magnetism; Source apportionment