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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/1452

Title: Capacidade de absorção do chumbo por plantas do género Cistus espontâneas em ambientes mineiros
Other Titles: Lead uptake capacity of Cistus plants growing in mining areas
Authors: Abreu, Maria Manuela
Santos, E.S.
Anjos, C.
Magalhães, M.C.F.
Nabais, C.
Keywords: lead uptake
mining area
absorção de chumbo
Issue Date: Jan-2009
Publisher: Sociedade de Ciências Agrárias de Portugal
Citation: "Revista de Ciências Agrárias". ISSN 0871-018X. 32:1 (2009) 170-181
Abstract: Mining activity can give rise to large quantities of chemically unstable waste rocks and tailings which can drain potential environmentally harmful lixiviates rich in chemical elements. Plants growing in such environments can minimize chemical, physical and visual negative impacts. To evaluate lead absorption by native Cistus growing in Braçal (NW Portugal) and São Domingos (SE Portugal) mining areas, Cistus inflatus (aerial parts) and Cistus ladanifer (leaves) were analysed by instrumental neutron activation analysis and atomic absorption spectrometric, respectively, after acid digestions. Soils were characterized by pH(H2O), organic carbon, cation exchange capacity, free Fe and Mn, total nitrogen, and assimilable K and P. Total lead was determined in soils (fraction < 2 mm) by inductively coupled plasma emission spectrometry after acid digestion, and Pb available fraction was determined by atomic absorption spectrometric and inductively coupled plasma mass spectroscopy after calcium nitrate extraction. High concentrations of total Pb are present in both mining areas soils. However, in São Domingos soils the Pb available fraction is smaller (8.3–67.3 mg kg-1) than in Braçal (276–6175 mg kg-1). Cistus inflatus aerial parts contain higher concentrations of lead (49.5–217 mg kg-1) than Cistus ladanifer leaves (40.4–48.6 mg kg-1). Both Cistus, showing no external stress signals, are well adapted to these contaminated soils with low nutrient and high Pb contents. It is apparent that these plants can be used for phytostabilization in similar mining areas.
URI: http://hdl.handle.net/10400.5/1452
ISSN: 0871-018X
Appears in Collections:DCA - Artigos de Revistas

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