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dc.contributor.authorFont, Oriol
dc.contributor.authorMoreno, Teresa
dc.contributor.authorQuerol, X.
dc.contributor.authorMartins, Vania
dc.contributor.authorSánchez-Rodas Navarro, Daniel Alejandro 
dc.contributor.authorMiguel, Eladio de
dc.contributor.authorCapdevila, Marta
dc.identifier.citationFont, O., Moreno, T., Querol, X., Martins, V., Sánchez Rodas, D., de Miguel, E., & Capdevila, M. (2019). Origin and speciation of major and trace PM elements in the Barcelona subway system. In Transportation Research Part D: Transport and Environment (Vol. 72, pp. 17–35). Elsevier BV.
dc.identifier.issn1361-9209 (electrónico)
dc.description.abstractWear in train and rail components in the Barcelona subway system includes brake pads, catenary wires, wheels, railways, and motor brushes. These components were characterised to evaluate their contribution to ambient particulate matter (PM) levels in two platforms (conventional F-L3 and new S-L9). The observed chemical compositions of these components were used to interpret the mineralogical, chemical, and leachability patterns of subway platform particulate matter (PM). The use of sulphides such as molybdenite (MoS2), pyrite (FeS2), stibnite Sb2S3) rich in toxic elements such as in Cu, Ni, As, Hg, Cd, and Pb and abrasives such barite (BaSO4) and zinzite (ZnO) in the brake pad composition, the composition of the catenary rich in Cu (98% metallic-Cu) with traces of Hg and that of the wheel/rail (98% metallic-Fe) with traces of As results in the production of fine PM particles of As, Hg, Cu, and Sb in ambient air PM in platform as a consequence of the abrasion/friction and sparking processes. The temperature reached in the aforementioned processes give rise to fine condensed and water-soluble As species (most likely As2O3 and As2O5). Moreover, the stibnite (Sb2S3) Hg-rich lateral brake pads used in L9 also contribute to fine and relatively soluble Sb and Hg oxides. Sulphide-rich brake pads significantly increase and change the occurrence mode of the Zn, Cu, Mn, Cr, Pb, and Ni present in PM by oxidation of brake-bearing metal sulphide to relatively water-soluble sulphate and oxide species. These changes in the mode of occurrence and speciation of elements in the PM of subway platforms points to the need for in-depth PM speciation studies, as well as the need for substituting conventional friction materials with low-metal materials—such as graphite pantographs/catenaries and rubber wheels and low toxic sulphides in brake pads—to reduce exposure to metals during subway commuting.es_ES
dc.description.sponsorshipThis work was supported by the Spanish Ministry of Economy and Competitiveness, and FEDER funds within the I + D Project CGL2012-33066 (SUBWAY) and the IMPROVE LIFE project (LIFE13 ENV/ES/ 000263). Support is also acknowledged to Generalitat de Catalunya 2014 SGR33es_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.subject.otherBrake padses_ES
dc.subject.otherTrace elementses_ES
dc.titleOrigin and speciation of major and trace PM elements in the Barcelona subway systemes_ES
dc.subject.unesco23 Químicaes_ES

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