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Efeito da congelação e armazenamento de amostras de plasma na estabilidade de e...

Comparação de correctivos aplicados a um solo de uma área mineira contaminado c...

Three amendments (iron oxides, Fe; organic matter, MO; calcium phosphate, PCa) were applied to a naturally contaminated soil with arsenic and their effect on the growth of tomato plants and Italian parsley was studied. The results indicate differences associated with the availability of arsenic in the soil in the presence of amendments: Fe had no influence on arsenic availability compared with the unamended soi...

Avaliação biogeoquímica dos solos e do medronheiro na área mineira da Panasqueira

Panasqueira mine is one of the most important mines in Portugal. Over the last century exploration of tungsten, copper and tin has contributed to produce many waste materials that constitute tailings with huge dimensions generating high visual and chemical impacts. The objective of this work was to study the biogeochemical impact of mining on the soils and arbutus trees (Arbutus unedo) in this area

Disponibilidade de Cu, Pb e Zn nas áreas mineiras de Canal Caveira e São Doming...

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 ...

Fases portadoras do arsénio em solos da área mineira de São Domingos e em solos...

São Domingos mining area is located in the Iberian Pyrite Belt, in south-east Portugal. Intensive gossan gold, copper and silver mining was done in roman times. More recently, mining activities were concentrated in the copper, zinc, arsenic and lead rich sulfide orebodies. To evaluate arsenic hazard, soils developed on the gossan mine waste piles were analysed, using as reference non- contaminated soils from Po...

Capacidade de absorção do chumbo por plantas do género Cistus espontâneas em am...

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 in...

Efeito da gestão de residuos de abate nas características do solo e no crescime...

Soil characteristics and tree growth as affected by slash management were assessed after the first clearcutting of a Eucalyptus globulus coppice plantation. The field trial was installed in March 1993, after the clearcutting of trees at the end of the first rotation. Treatments were removal (R), incorporation into the soil (I) and maintenance on the soil surface (S) of slash and forest floor litter layer; in t...

Aplastic crisis due to human parvovirus B19 infection in hereditary hemolytic a...

Specific anti-B19 IgM was demonstrated in sera from three children showing transient aplastic crisis. A two years-old boy living in Rio de Janeiro suffering from sickle-cell anaemia showed the crisis during August, 1990. Two siblings living in Santa Maria, RS, developed aplastic crisis during May, 1991, when they were also diagnosed for hereditary spherocytosis. For a third child from this same family, who firs...