Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/3403
Título: Evaluation of atmospheric deposition and patterns of polycyclic aromatic hydrocarbons in façades of historic monuments of Oporto (Portugal)
Autor: Slezakova, Klara
Castro, Dionísia
Begonha, Arlindo
Delerue-Matos, Cristina
Alvim-Ferraz, Maria da Conceição M.
Morais, Simone
Pereira, Maria do Carmo
Palavras-chave: Air pollution
Polycyclic aromatic hydrocarbons (PAHs)
Traffic emissions historical monuments
Thin black layers
Data: 2013
Editora: Taylor & Francis
Relatório da Série N.º: International Journal of Environmental Analytical Chemistry; Vol. 93, Issue 10
Resumo: Atmospheric pollution by motor vehicles is considered a relevant source of damage to architectural heritage. Thus the aim of this work was to assess the atmospheric depositions and patterns of polycyclic aromatic hydrocarbons (PAHs) in façades of historical monuments. Eighteen PAHs (16 PAHs considered by US EPA as priority pollutants, dibenzo[a,l]pyrene and benzo[j]fluoranthene) were determined in thin black layers collected from façades of two historical monuments: Hospital Santo António and Lapa Church (Oporto, Portugal). Scanning electron microscopy (SEM) was used for morphological and elemental characterisation of thin black layers; PAHs were quantified by microwave-assisted extraction combined with liquid chromatography (MAE-LC). The thickness of thin black layers were 80–110 μm and they contained significant levels of iron, sulfur, calcium and phosphorus. Total concentrations of 18 PAHs ranged from 7.74 to 147.92 ng/g (mean of 45.52 ng/g) in thin black layers of Hospital Santo António, giving a range three times lower than at Lapa Church (5.44– 429.26 ng/g; mean of 110.25 ng/g); four to six rings compounds accounted at both monuments approximately for 80–85% of ΣPAHs. The diagnostic ratios showed that traffic emissions were significant source of PAHs in thin black layers. Composition profiles of PAHs in thin black layers of both monuments were similar to those of ambient air, thus showing that air pollution has a significant impact on the conditions and stone decay of historical building façades. The obtained results confirm that historical monuments in urban areas act as passive repositories for air pollutants present in the surrounding atmosphere.
Peer review: yes
URI: http://hdl.handle.net/10400.22/3403
ISSN: 0306-7319
Versão do Editor: http://www.tandfonline.com/doi/abs/10.1080/03067319.2013.775279#.UtlHd0r6Q24
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