Please use this identifier to cite or link to this item: http://hdl.handle.net/10174/10883

Title: Caracterização de aerossóis de Évora
Authors: Tobias, Lúcia da Conceição Nunes Santos Vieira
Advisors: Schiavon, Nick
Dias, Cristina
Wagner, Frank
Keywords: Aerossóis Atmosféricos
Évora
Cascade impactor
Sedimentation
PM aerosols
Évora
Cascade impactor
Sedimentation
Issue Date: 2013
Publisher: Universidade de Évora
Abstract: O presente trabalho teve como objetivo a caraterização química e morfológica de aerossóis atmosféricos de Évora, Alentejo, Portugal e relacioná-los com as suas origens e fontes. A amostragem do material particulado foi efetuada na plataforma observatória do Centro de Geofísica da Universidade de Évora, através de dois tipos de amostragem: “Cascade Impactor” e bomba de vácuo de grande volume, durante dois meses (08-2011/ 02-2012) e “Sedimentation”, durante 8 meses (08-2011 a 03-2012). A caraterização química e morfológica das partículas inorgânicas de aerossóis foi realizada por SEM-EDS e permitiu realizar um sistema de classificação química das partículas, identificandose maioritariamente Desert Dust, Sea Salts, Ca-Rich, Fe-Rich, Mixtures e Sulphates. As retrotrajetórias (HYSPLIT model) atmosféricas permitiram averiguar acerca das origens das partículas (Desert Dusts do Sahara). Na fração orgânica foram identificados PAH’s por GC-MS. Os principais PAH’s encontrados foram o acenaftileno, acenafteno e naftaleno, considerados menos problemáticos para o ambiente; ### ABSTRACT: Aim of the study was the chemical and morphological characterization and source apportionment of PM aerosols in Evora. Sampling was carried at the station of the Evora Geophysics Centre of Evora using two types of protocols. a) Cascade Impactor: particles were collected on TEM grids for two months (08-2011/02-2012; b) Sedimentation mode: particles were collected using a modified version of the aerosol passive sampler Type A. Filters were analyzed by VP SEM-EDS to obtain morphological and elemental chemical data for the inorganic fraction and by GC-MS for the organic fraction. SEM+EDS analysis allowed the classification of the aerosols into different classes of which Desert Dust, Sea-Salt, Ca-rich, Fe-rich, Mixtures and Sulphates were the most abundant. Back Wind Trajectories (HYSPLIT model) confirmed Saharian Dust as the main aerosol source. Within the organic fraction, the GC-MS study identified PAH (Acenaphthylene, Acenaphthene, Naphthalene) which were not considered to represent a major environmental threat.
URI: http://hdl.handle.net/10174/10883
Type: masterThesis
Appears in Collections:BIB - Formação Avançada - Teses de Mestrado

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