18 documents found, page 1 of 2
Stream sediments as a repository of U, Th and As around abandoned uranium mines...
Carvalho, P. C. S.; Antunes, Isabel Margarida Horta Ribeiro; Albuquerque, M. T. D.; Santos, A. C. S.; Cunha, Pedro ProençaThis work focuses on the study of water–sediment interaction around abandoned uranium mines with open-pit lakes and mine dumps. Nineteen water and eleven stream sediment samples were collected in the abandoned Barrôco D. Frango mine, central Portugal. The trace element distribution was compared with other abandoned uranium mines in Portugal and worldwide. Generally, U, Th, and As contents in the open-pit water ...
Groundwater vulnerability assessment in the Naturtejo UNESCO Global Geopark, Po...
Albuquerque, M. T. D.; Roque, N.; Rodrigues, J.; Antunes, Isabel Margarida Horta Ribeiro; Silva, C.Nowadays, groundwater vulnerability assessment has become a useful tool for groundwater contamination prevention. Groundwater vulnerability maps provide useful data to protect groundwater resources and work as a tool for the improvement of changes in agricultural patterns and land use applications. The study area of this research survey is the Naturtejo UNESCO Global Geopark, located in central inland Portugal ...
Effects of wastewater treatment plant’s discharges on a freshwater ecosystem—a ...
Almeida, P.; Albuquerque, M. T. D.; Antunes, Isabel Margarida Horta Ribeiro; Ferreira, A.; Pelletier, G.Sewage discharges constitute severe stress in freshwater ecosystems. The Ramalhoso River belongs to the Tagus river watershed and was chosen for a pilot study on the impact of wastewaters discharges in a freshwater ecosystem and its ability for self-depuration. Twelve water samples were collected along the river and were georeferenced. The first point is located upstream of the first discharge point, the second...
Predicting ore content throughout a machine learning procedure – An Sn-W enrich...
Iglesias, C.; Antunes, Isabel Margarida Horta Ribeiro; Albuquerque, M. T. D.; Martínez, J.; Taboada, J.The distribution patterns of trace elements are a very useful tool for the prediction of mineral deposits occurrence and possible future exploitation. Machine learning techniques were used for the computation of adequate models in trace elements’ prediction. The main subject of this research is to define an adequate model to predict the amounts of Sn and W in the abandoned mine area of Lardosa (Central Portugal...
Assessment of metal and metalloid contamination in the waters and stream sedime...
Neiva, A. M. R.; Carvalho, P. C. S.; Antunes, Isabel Margarida Horta Ribeiro; Albuquerque, M. T. D.; Santos, A. C. S.; Cunha, P. P.; Henriques, S. B. A.In the abandoned Mortórios uranium mine area there are quartz veins containing wolframite and sulphides and basic rock dykes with torbernite and autunite cutting a porphyritic granite. The basic rock dykes were exploited and produced about 27 tonnes of U3O8, from 1982 to 1988. There are an open pit lake and nine dumps. Surface water and groundwater are contaminated in U, As, Cd, Cr, Cu, Fe, Mn, Ni and Pb. Strea...
Impact of Sewage Effluent Discharges prediction using QUAL2Kw in a sensitive pr...
Albuquerque, M. T. D.; Antunes, Isabel Margarida Horta Ribeiro; Oliveira, N. P.; Pelletier, G.The quality of water, under the influence of the wastewater treatment plant's discharges, makes the simulation of the water parameters a key issue, broadly when considering intermittent rivers. In the case of study, the Pracana reservoir works as an example of the characterization, monitoring, and control of the impact of several, wastewater treatment plant's discharges, directly contributing to water quality. ...
Assessment of metal and metalloid contamination in soils trough compositional d...
Neiva, A. M. R.; Albuquerque, M. T. D.; Antunes, Isabel Margarida Horta Ribeiro; Carvalho, P. C. S.; Santos, A. C. T.; Boente, C.; Cunha, P. P.Soils from the old Mortórios uranium mine area were studied to look for contamination, as they are close to two villages, up to 3 km away, and used for agriculture. They are mainly contaminated in U and As and constitute an ecological threat. This study attempts to outline the degree to which soils have been affected by the old mining activities through the computation of significant hot clusters, Traditional g...
A new thermal mineral water from Águas (Penamacor, Central Portugal): Hydrogeoc...
Gomes, L. M. Ferreira; Antunes, Isabel Margarida Horta Ribeiro; Albuquerque, M. T. D.; Silva, A. J. SantosThermal mineral waters are a potential resource in the local and economic development of a region. The thermal area of Termas das Águas is in the inner region of central Portugal and its grant will enable the exploration and exploitation of this water resource for medical and therapeutic purposes through a thermal medical SPA. In Portugal, the classification and legalization of a thermal unit must provide a nat...
Avaliação do risco ambiental de elementos potencialmente tóxicos em sedimentos ...
Antunes, Isabel Margarida Horta Ribeiro; Albuquerque, M. T. D.Os elementos potencialmente tóxicos (EPT) em sedimentos de corrente constituem uma importante ferramenta na avaliação do risco ambiental na influência de depósitos minerais. A região de Monfortinho está localizada na bacia hidrográfica do rio Erges, que faz fronteira com Espanha. Desde a época romana, que se conhecem evidências da exploração de ouro sedimentar nesta região do país, a qual tem vindo a desaparece...
Spatial environmental risk evaluation of potential toxic elements in stream sed...
Antunes, Isabel Margarida Horta Ribeiro; Albuquerque, M. T. D.; Roque, N.Potential toxic elements (PTE), in stream sediments, were used as contamination indicators for the definition of high-/low-grade spatial clusters in the Monfortinho area (Central Portugal). A set of 271 stream sediment samples was used for spatial modelling and further definition of rings of enrichment-high and low rings. A three-step multivariate statistical and geostatistical approach was used: (1) principal ...