Disponibilidade de Cu, Pb e Zn nas áreas mineiras de Canal Caveira e São Domingos - Faixa Piritosa Ibérica Availability of Cu, Pb and Zn in Canal Caveira and São Domingos mine areas from Iberian Pyrite Belt

Abstract

Avaliou-se a disponibilidade do Cu, Pb e Zn nos solos das áreas mineiras de São Domingos e Canal Caveira (Faixa Piritosa Ibérica) com o objectivo de determinar a potencialidade de dispersão daqueles ele­mentos no meio. Em ambas as áreas as concentrações totais dos elementos foram elevadas e a dis­ponibilidade variou consoante as parcelas e, consequentemente, com as características dos solos. A fracção disponível de Pb é superior nos solos de Canal Caveira, contu­do para o Zn observou-se o contrário. Em ambos os solos, a fracção de Cu disponível é Several mining areas are abandoned in the Iberian Pyrite Belt (IPB) leading to important points of environmental con­tamination. The potential and immediate environmental risk and impact on public health of hazardous elements from soil can be estimated from availability analy­sis. The aim of this study was to evaluate the availability of Cu, Pb and Zn in São Domingos and Canal Caveira mining ar­eas located in the IPB. Both mining areas had high soil ele­mental total concentrations. Metals avail­ability changed with plots and, is related with soils characteristics. In Canal Caveira mine area, the Pb available frac­tion in soils was higher than in São Domingos soils however, the opposite was observed for Zn. The fractions of available Cu, in both mine soils, are <0.6 % of the total concentration. In both min­ing areas, Cu and Zn are mainly associ­ated with the residual fraction, while Pb is associated with residual fraction in São Domingos and with organic matter in Ca­nal Caveira soils.

Keywords

• dispersão
• disponibili­dade
• fases suporte
• minas abandonadas
• abandoned mines
• availabil­ity
• elements leaching
• elements partition­ing