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Contaminação ambiental provocada pela antiga mina de urânio de Pinhal do Souto, centro de Portugal
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Advisor(s)
Abstract(s)
A mina de urânio de Pinhal do Souto foi explorada
subterraneamente entre 1978 e 1989, tendo produzido 93091 kg de
U3O8. Na área ficaram duas escombreiras, parcialmente cobertas por
vegetação natural. Nesta mina foi explorado um filão de quartzo
contendo autunite e torbernite, que corta um granito de duas micas. A
mina está a causar contaminação em U, As, Cd, Cr, Cu, Fe, Ni e Pb
nas águas, em Cr, Mn, Pb, Cd, Co, Fe, Th, Zn e, por vezes, em U nos
sedimentos de corrente e em Cu, Pb, Zn, As, Cd e Sb nos solos. Os
valores da mediana de Fe, As, Cd, Pb, Sb, Th, U, W e Zn destes solos
são superiores aos dos solos dos países europeus dos dados
FOREGS. forma complexos com nas águas que têm pH
neutro a alcalino. As concentrações de U na água são superiores aos
limites para uso humano nas épocas húmida e seca, mas são maiores
na época húmida por os minerais secundários de U se dissolverem e
o U ser libertado na água. Os teores de metais e As são maiores na
água da época seca devido à evaporação. Os solos têm vermiculite e,
por isso, retêm maiores concentrações de metais do que os
sedimentos de corrente que possuem caulinite. Devido aos valores de
pH ligeiramente ácidos a neutros das águas, há a ocorrência de
precipitados de óxido de Fe, sobretudo nas saídas de galerias
subterrâneas, que são ricos em óxidos-hidróxidos e matéria orgânica
e que retêm grandes quantidades de metais U, Th e As.
Abstrac: The Pinhal do Souto uranium mine was exploited underground between 1978 and 1989 and produced 93091 kg U3O8. Two dumps partially covered by natural vegetation were left in the area. The mine exploited a quartz vein containing autunite and torbernite that cuts a two-mica granite. The mine caused contamination in U, As, Cd, Cr, Cu, Fe, Ni and Pb in waters, in Cr, Mn, Pb, Cd, Co, Fe, Th, Zn and locally in U in stream sediments and in Cu, Pb, Zn, As, Cd and Sb in soils. The median values of Fe, As, Cd, Pb, Sb, Th, U, W and Zn of these soils are higher than those of soils from European countries of the FOREGS data. is complexed with in waters under neutral to alkaline pH. The U concentrations in water are higher than the limits for human use in wet and dry seasons, but are higher in the wet season, because secondary uranium minerals are dissolved and uranium is released into the water. The metals and As contents are higher in water from the dry season, due to the evaporation. As the soils contain vermiculite they retain higher metals concentrations than stream sediments, which contain kaolinite. The Fe-oxide precipitate is richer in oxydroxydes and organic matter than stream sediments and consequently has higher concentrations of several metals, including U and Th and the metalloid As.
Abstrac: The Pinhal do Souto uranium mine was exploited underground between 1978 and 1989 and produced 93091 kg U3O8. Two dumps partially covered by natural vegetation were left in the area. The mine exploited a quartz vein containing autunite and torbernite that cuts a two-mica granite. The mine caused contamination in U, As, Cd, Cr, Cu, Fe, Ni and Pb in waters, in Cr, Mn, Pb, Cd, Co, Fe, Th, Zn and locally in U in stream sediments and in Cu, Pb, Zn, As, Cd and Sb in soils. The median values of Fe, As, Cd, Pb, Sb, Th, U, W and Zn of these soils are higher than those of soils from European countries of the FOREGS data. is complexed with in waters under neutral to alkaline pH. The U concentrations in water are higher than the limits for human use in wet and dry seasons, but are higher in the wet season, because secondary uranium minerals are dissolved and uranium is released into the water. The metals and As contents are higher in water from the dry season, due to the evaporation. As the soils contain vermiculite they retain higher metals concentrations than stream sediments, which contain kaolinite. The Fe-oxide precipitate is richer in oxydroxydes and organic matter than stream sediments and consequently has higher concentrations of several metals, including U and Th and the metalloid As.
Description
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Keywords
Antiga mina de urânio Água Sedimentos de corrente Solos Contaminação Old uranium mine Water Stream sediments Soils Contamination
Pedagogical Context
Citation
NEIVA, A.M.R. [et al.] (2014) - Contaminação ambiental provocada pela antiga mina de urânio de Pinhal do Souto, centro de Portugal. In Congresso Nacional de Geologia, 9, Congresso de Geologia dos Países de Língua Oficial Portuguesa, 2, Porto. Comunicação oral.