66 documents found, page 1 of 7
Characterization of saline waters from Ria de Aveiro (Portugal) for potential u...
Almeida, Lara; Rocha, Fernando; Candeias, CarlaABSTRACT: This study aims to characterize the properties of the saline waters from an old saltpan at the Ria de Aveiro, and assess its potential use in skin treatments. Eight water samples were collected from two different areas of an open-air salt SPA, during four different climatic seasons between 2020 and 2021. Physichochemical parameters of the waters revealed an alkaline pH and high electrical conductivity...
Investigating the hydrothermal activity at Fogo volcano (Cape Verde) using geoc...
Candeias, Carla; Rocha, Fernando; Dumont, Stéphanie; Maineult, Alexis; Ramalho, Ricardo; Madeira, José; Antunes, JoãoABSTRACT: Characterizing hydrothermal systems at volcanoes is particularly important as they play a crucial role in controlling eruptive dynamics. On the long term, hydrothermal systems participate in the geochemical alteration of both rocks and soils, through hydrolysis, dissolution, mineral precipitation, and secondary mineralization contributing in the gradual destabilization of volcanic structures. Fogo vol...
XVI Congresso de Geoquímica dos Países de Língua Portuguesa: Contributos da Geo...
Silva, Eduardo Ferreira da; Patinha, Carla; Durães, Nuno; Candeias, CarlaSem resumo disponível.
The contribution of Hulene-B waste dump (Maputo, Mozambique) for the contaminat...
Bernardo, Bernardino; Candeias, Carla; Rocha, FernandoThe contamination of ecosystems in areas around waste dumps is a major threat to the health of surrounding populations. The aim of this study is to understand the contribution of the Hulene-B waste dump (Maputo, Mozambique) to the contamination of edible plants, rhizosphere soils, stream waters, and groundwater, and to assess human health risk. Soil and plant samples were analyzed by XRD and XRF for mineralogic...
Geophagy and its potential human health implications: a review of some cases fr...
Malepe, Retshepile Evelyn; Candeias, Carla; Mouri, HassinaThe complex human behaviour of eating earthy materials is known as geophagy. It is of worldwide concern because of its potential health implications associated with the practice. South Africa is one of the developing countries where geophagy is predominant with several motivations attributed to justify the practice. However, the aetiology and possible health risks of geophagy are poorly understood among the geo...
Chemical fractionation of particulate-bound metal(loid)s to evaluate their bioa...
Mishra, Archi; Pervez, Shamsh; Verma, Madhuri; Candeias, Carla; Pervez, Yasmeen Fatima; Dugga, Princy; Verma, Sushant Ranjan; Karbhal, IndrapalEleven potentially toxic metal(loid)s (Al, As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn), proven source markers of mineral based coal-fired industrial emissions and vehicular exhausts, were analysed using the four steps sequential extraction method to evaluate metal(loid)s concentration, in total and fractions of bioavailable and non-bioavailable for fine (PM2.5) and coarse (PM10–2.5) particulate modes. A total o...
Heavy metal pollution in mine–soil–plant system in S. Francisco de Assis – Pana...
Candeias, Carla; Melo, Rita; Ávila, Paula Freire; Silva, Eduardo Ferreira da; Salgueiro, Ana Rita; Teixeira, João PauloThe active Panasqueira mine is a tin–tungsten (Sn–W) mineralization hosted by metasediments with quartz veins rich in ferberite. The economic exploitation has been focused on wolframite, cassiterite and chalcopyrite. The mineralization also comprises several sulphides, carbonates and silver sulphosalts. The mining and beneficiation processes produces arsenic-rich mine wastes laid up in huge tailings and open ai...
Acid mine drainage from the Panasqueira mine and its influence on Zêzere river ...
Candeias, Carla; Ávila, Paula Freire; Silva, Eduardo Ferreira da; Ferreira, Adelaide; Salgueiro, Ana Rita; Teixeira, João PauloThe Panasqueira hydrothermal mineralization, located in central Portugal, is the biggest Sn–W deposit of the Western Europe. The main evidences of the mining exploitation and ore treatment operations are testified with huge tailings, mainly, in the Rio and Barroca Grande areas. The mining and beneficiation processes, at the site, produces metal rich mine wastes. Oxidation of sulfides tailings and flow from open...
Quantitative–spatial assessment of soil contamination in S. Francisco de Assis ...
Silva, Eduardo Ferreira da; Ávila, Paula Freire; Salgueiro, Ana Rita; Candeias, Carla; Pereira, Henrique GarciaThrough the years, mining and beneficiation processes produces large amounts of As-rich mine wastes laid up in huge tailings and open-air impoundments (Barroca Grande and Rio tailings) that are the main source of pollution in the surrounding area once they are exposed to the weathering conditions leading to the formation of AMD and consequently to the contamination of the surrounding environments, in particular...
Potentially toxic elements dynamics in the soil rhizospheric-plant system in th...
Candeias, Carla; Ávila, Paula Freire; Sequeira, Cristina; Albuquerque, Manuel; Rocha, FernandoABSTRACT: Volcanic eruptions disturb directly and indirectly the ecosystems. Direct impact occurs on the soil-plant system with an input of new elements and indirect hazard occurs by consumption of these plants. Fogo island (Cape Verde Republic) has an active volcano and the last eruption occurred in 2014-15, expelling large amounts of materials that spread all over the island. Soils and edible plants were coll...