Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/2164
Título: Quantitative-spatial assessment of soil contamination in S. Francisco de Assis due to mining activity of the Panasqueira mine (Portugal)
Autor: Silva, Eduardo Ferreira da
Ávila, Paula Freire
Salgueiro, Ana Rita
Candeias, Carla
Pereira, Henrioque Garcia
Palavras-chave: Contaminação do ambiente
Contaminação de solos
Actividade mineira
Minas da Panasqueira (Portugal)
Data: Nov-2013
Citação: Silva, Eduardo Ferreira da... [et al.] - Quantitative-spatial assessment of soil contamination in S. Francisco de Assis due to mining activity of the Panasqueira mine (Portugal). In: Environmental Science Pollution Research, Vol. 20, Issue 11 (November 2013), p. 7534-7549
Resumo: Through the years, mining and beneficiation processes produces large amounts of As-rich mine wastes laid up in huge tailings and open-air impoundments (Barroca Grande and Rio tailings) that are the main source of pollution in the surrounding area once they are exposed to the weathering conditions leading to the formation of AMD and consequently to the contamination of the surrounding environments, in particularly soils. In order to investigate the environmental contamination impact on S. Francisco de Assis (village located between the two major impoundments and tailings) agricultural soils, a geochemical survey was undertaken to assess toxic metals associations, related levels and their spatial distribution, and to identify the possible contamination sources. According to the calculated contamination factor, As and Zn have a very high contamination factor giving rise to 65.4 % of samples with a moderate to high pollution degree; 34.6 % have been classified as nil to very low pollution degree. The contamination factor spatial distribution put in evidence the fact that As, Cd, Cu, Pb, and Zn soils contents, downstream Barroca Grande tailing, are increased when compared with the local Bk soils. The mechanical dispersion, due to erosion, is the main contamination source. The chemical extraction demonstrates that the trace metals distribution and accumulation in S. Francisco de Assis soils is related to sulfides, but also to amorphous or poorly crystalline iron oxide phases. The partitioning study allowed understanding the local chemical elements mobility and precipitation processes, giving rise to the contamination dispersion model of the study area. The wind and hydrological factors are responsible for the chemical elements transport mechanisms, the water being the main transporter medium and soils as one of the possible retention media.
URI: http://hdl.handle.net/10400.9/2164
ISSN: 0944-1344
Versão do Editor: http://dx.doi.org/10.1007/s11356-013-1495-2
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