Trabalho apresentado em 7th Iberian Meeting Aerosol Science and Technology – RICTA19, 2019, Lisbon, PortugalN/

Almeida, S. M.

Canha, N.

Coutinho, J. T.

Gamelas, Carla A.

Justino, A. R.

Kertesz, Z.

English

Gamelas ou Carla A. Gamelas, Carla

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 CHARACTERIZATION OF A SETTLED DUST EVENT IN AN URBAN AREA AFFECTED BY INDUSTRIAL ACTIVITIES   C. Gamelas1,2, A.R. Justino1, N. Canha1,3, J.T. Coutinho1, Z. Kertesz4, S.M. Almeida1 1Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, Universidade de Lisboa, 2695-066 Bobadela LRS, Portugal 2Escola Superior de Tecnologia de Setúbal, Instituto Politécnico de Setúbal, 2910-761 Setúbal, Portugal 3CESAM - Centre for Environmental and Marine Studies, University of Aveiro, 3810-193 Aveiro, Portugal 4Institute for Nuclear Research, Hungarian Academy of Sciences, Debrecen, Hungary Keywords: Air pollution; industrial environments; pollution sources; settled dust; PIXE Presenting author email: carla.gamelas@ctn.tecnico.ulisboa.pt  Due to a higher awareness of citizens towards air pollution, the population of the Seixal municipality (Portugal), noticed occasional settled dust events and questioned the local authorities in order to understand its sources and potential health hazards. Aiming to address the population’s needs, the local council promoted a set of actions. Therefore, this study aimed to identify possible sources of a settled dust event that occurred in January 2019, in Seixal municipality, an urban area with 165 547 inhabitants, located nearby an industrial area, characterized by a steelwork, shipyard and other metallurgic activities. The chemical characterization of the settled dust  was determined by PIXE (Fig. 1), focusing on a total of 29 elements.   Fig. 1. Micro-PIXE elemental maps of a sample  Comparison with the chemical profiles of particulate matter from different types of environment was conducted (Fig. 2). For that purpose, a literature review was performed to gather mean values of the chemical composition of PM10 for different settings, in different countries (1-5, among other references).    Fig. 2. Comparison of elemental mass fractions of the studied settled dust and in PM10 studies available in the literature  The assessment of crustal enrichment factors (EF) was also performed (Fig. 3). Several elements presented EF values above the threshold of 10, which indicates their non-crustal origin.   Fig. 3 Crustal enrichment factors for the studied settled dust The above mentioned analysis, along with Spearman correlations between the assessed elements, allowed to understand which sources contributed to the settled dust event. The influence of a nearby industrial area was identified, due to the contents of Fe, Cr and Mn, which are typical tracers of iron and steel industries.  This work was supported by FCT – Fundação para a Ciência e a Tecnologia, I.P. (Portugal) through the UID/Multi/04349/2013 project.  [1] Amato F. et al. (2016) AIRUSE-LIFE+: A harmonized PM speciation and source apportionment in five southern European cities. Atmos Chem Phys, 16, 3289–3309.  [2] Aldabe J. et al. (2011) Chemical characterisation and source apportionment of PM2.5 and PM10 at rural, urban and traffic sites in Navarra (North of Spain). Atmos Res, 102, 191–205. [3] Rodríguez S. et al. (2004) Comparative PM10-PM2.5 source contribution study at rural, urban and industrial sites during PM episodes in Eastern Spain. Sci Total Environ, 328, 95–113.  [4] Sylvestre A. et al. (2017) Comprehensive chemical characterization of industrial PM2.5 from steel industry activities. Atmos Environ, 152, 180–190.  [5] Querol X. et al. (2007) Source origin of trace elements in PM from regional background, urban and industrial sites of Spain. Atmos Environ, 41, 7219–7231.  Fe Ca Si Al MgMn Cr Na Ti S Zn Cl P K Ba V Co Cd Cu Sr Pb Nb Zr Hf Ni Ge Br Ga Se1101001000100001000001000000 Mass Fraction (g.g-1) Settled Dust  Industrial with Steelworks  Urban  RuralElementsK Na Si Al Ti O Zr Sr Ni P MgGa Ba Fe Ca Cu V S Ge Cl Nb Pb ZnMn Br Co Hf Cr Se Cd0.010.1110100100010000  Enrichment Factor, EFXElements

Characterization of a settled dust event in an urban area affected by industrial activities

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Characterization of a settled dust event in an urban area affected by industrial activities

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