Loading...
12 results
Search Results
Now showing 1 - 10 of 12
- Distribuição de estanho em solos e em estevas da área envolvente das minas de Neves CorvoPublication . Batista, Maria Joao; Abreu, Maria Manuela; Pinto, M. Serrano
- Chemical elements variation in leaves with different development stages of Cistus plants from S. Domingos mine area, South PortugalPublication . Batista, Maria Joao; Gonzalez-Fernandez, Oscar; Abreu, Maria Manuela; Carvalho, L.Soils and leaves of Cistus ladanifer L. and Cistus salviifolius L. in different stages of development (young and mature) were sampled in different sites of the S. Domingos mine. The soils are thin and were developed on heterogeneous materials of metallurgical slags, gossanous materials and weathered host rocks. In general, mature leaves have higher concentrations of As, Cu, Fe, Mn, Pb and Zn than young leaves. Nevertheless, in Moitinhos site the young leaves have higher concentrations of As, Cu and Mn than mature leaves. Near the mining buildings C. ladanifer leaves have higher concentrations of As in mature leaves than C. salviifolius. The Pb concentrations in mature leaves are significantly higher and C. ladanifer contain two fold more than C. salviifolius leaves. Cistus plants show different behaviour on the trace elements uptake and translocation. This knowledge is useful in order to implement remediation programs in mine areas of the Mediterranean region using these pioneer plants.
- Contribution of Cistus ladanifer L. to natural attenuation of Cu and Zn in some mine areas of the Iberian Pyrite BeltPublication . Batista, Maria Joao; Abreu, Maria ManuelaThe comparison between four groups of soils and rock plants (Cistus ladanifer L.) developed on these soils was made using three mine areas of different ages (Neves Corvo, Brancanes, Monte dos Mestres) and a control area (Lombador). Copper and zinc soil-plant realtionship was different in Neves Corvo, ongoing axploitation of copper and zinc, when compared with the control area of Lombador reflecting the actual influence of the present exploitation. The rock rose plants seem to have contributed to the natural attenuation of Cu in soils of Brancanes area where mining stopped more then a century ago.
- Avaliação por modelação em SIG da contaminação mineira por drenagem ácida em S. Domingos, Faixa Piritosa, AlentejoPublication . Batista, Maria Joao; Brito, M. G.; Abreu, Maria Manuela; Sousa, A. J.; Quental, Lídia; Vairinho, M. Margarida
- Utilização de imagens hiperespectrais na avaliação da contaminação mineira em S. Domingos, Faixa Piritosa, AlentejoPublication . Quental, Lídia; Brito, M. G.; Sousa, A. J.; Abreu, Maria Manuela; Batista, Maria Joao; Oliveira, Vítor M. J.; Vairinho, M. Margarida; Tavares, T.
- MINEO Southern Europe environment test site : contamination impact mapping and modelling : final ReportPublication . Quental, Lídia; Bourguignon, Anne; Sousa, António Jorge; Batista, Maria Joao; Brito, M. G.; Tavares, T.; Abreu, Maria Manuela; Vairinho, M. Margarida; Cottard, FrancisABSTRACT: Under the framework of the MINEO project, the abandoned S.Domingos mining area as been selected as representative of Southern Europe Environment to test methods and tools for assessing and monitoring the environmental impact of mining activities using hyperspectral data and other relevant data sets. The S.Domingos mining area, is characterised by a long-term mining activity, since pre-roman times till the 1960’s, and is included in the group of Volcanogenic Massive Sulphide deposits of the Iberian Pyrite Belt. The orebody contained Cu, and also Zn and Pb. Several facilities were developed for mining works and ore transportation, covering an area of 50km2, facilitating dispersion of related pollutants. The main environmental problems can be summarised as related to waste material and their pollutant content (Zn, Pb, Sb, Cu, As, Hg and Cd), acid waters (minimum pH value of 1.7) and associated dispersion, as well as landscape disruption. Hyperspectral images were able to identify mineralogical/chemical dispersion of waste material related to Acid Mine Drainage (AMD) following two approaches: one related to AMD waste material field spectra and the other based on AMD minerals, using standard spectral libraries. The processing techniques used were mainly based on the Spectral Angle Mapper classifier and Mixture Tunned Matched Filtering. Globally, both mapping results obtained, either in AMD waste material either in AMD minerals, were able to detect mineralogical/chemical characteristics of imaged ground data, which were validated by field data. The GIS geochemical modelling allowed the determination of effective AMD area of influence, based in water pH values, using geostatistical methods. The Indicator “Collocate-Cokriging” of the water pH using the distance to the highest correlated AMD waste material (mixed sulphur materials from hyperspectral classification) predicts the AMD dispersion in the area related to that material. This methodology achieved good results and could be applied in new areas using waste material hyperspectral image classification for AMD delimitation area.
- Land cover characterization and change detection using multispectral imagery for the Beira area, Mozambique : a preliminary approachPublication . Quental, Lídia; Oliveira, José Tomás; Dias, Ruben Pereira; Batista, Maria Joao; Fernandes, Judite
- Uranium in surface soils : an easy & quick assay combining X-Ray diffraction and X-Ray fluorescence qualitative dataPublication . Figueiredo, M. Ondina; Silva, Teresa; Batista, Maria Joao; Leote, Jaime; Ferreira, M. L.; Limpo, V.
- Uranium in surface soils : an easy & quick assay combining X-Ray diffraction and X-Ray fluorescence qualitative dataPublication . Figueiredo, M. Ondina; Silva, Teresa; Batista, Maria Joao; Leote, Jaime; Ferreira, M. L.; Limpo, V.
- Exposure to ionizing radiation and dangerous substances inside buildings related to construction productsPublication . Carvalho, F.P.; Paiva, J.V.; Carvalho, Jorge; Batista, Maria JoaoABSTRACT: The use of many materials of geological origin and recycled materials in the construction of buildings faces an increasing demand and stricter regulation for quality control. Construction products are requested to meet safety standards including those for radon exhalation and gamma radiation emission, amongst other dangerous substances, because if unchecked they could deteriorate the quality and safety of the indoor environment. Construction products shall pass testing for radioactivity in order to meet those standards and to maintain a high ranking position in the international markets.