11 research outputs found
A reusable evanescent wave immunosensor for highly sensitive detection of bisphenol A in water samples
Toxicity of Diclofenac: Cadmium Binary Mixtures to Algae Desmodesmus subspicatus Using Normalization Method
Biogeochemical mechanisms controlling trophic state and micropollutant concentrations in a tropical artificial lake
Universidade de BrasĂlia. Instituto de GeociĂȘncias. BrasĂlia, DF, Brazil.Universidade de BrasĂlia. Instituto de GeociĂȘncias. BrasĂlia, DF, Brazil.Universidade Federal de Tocantins. Departamento de QuĂmica Ambiental. Tocantins, TO, Brazil.Universidade de BrasĂlia. Instituto de GeociĂȘncias. BrasĂlia, DF, Brazil.Companhia de Saneamento do Distrito Federal. BrasĂlia, Df, Brazil.MinistĂ©rio da SaĂșde. Secretaria de VigilĂąncia em SaĂșde. Instituto Evandro Chagas. Ananindeua, PA, Brasil.Universidade de BrasĂlia. Instituto de GeociĂȘncias. BrasĂlia, DF, Brazil.Lake ParanoĂĄ is a human-made water reservoir created in 1959 together with the new capital of Brazil (Brasilia). With the demands of urban development, population growth, and land use changes, the lake presented severe deterioration of water quality due to the disposal of wastewater with a high concentration of nutrients. To better elucidate the natural and anthropogenic sources controlling the water quality from Lake ParanoĂĄ, this study aimed to (1) investigate the main geochemical processes controlling water quality of the lake and its tributaries; (2) evaluate Lake ParanoĂĄâs trophic state; and (3) determine the occurrence and fate of organic micropollutants in Lake ParanoĂĄ waters and WWTPs effluents. The waters from Lake ParanoĂĄ tributaries are naturally acidic due to the nature of the extremely weathered ferralsols and the crustal material composition. The main processes linked with anthropogenic activities that affect the water quality from the tributaries are the input of untreated domestic wastewater and the dissolution of carbonate minerals arising from construction material residues. Generally, the waters of Lake ParanoĂĄ presented low nutrient and chlorophyll-a concentrations, indicating a low trophic state (oligo-mesotrophic). A significant increase in the trophic state (super-eutrophic) was observed at specific regions of the lake that have high nutrient input from tributaries, caused by the continuous disposal of untreated domestic sewage. In Lake ParanoĂĄ waters, the organic micropollutants that were identified and quantified (caffeine, bezafibrate, bisphenol A, diethyl phthalate, and nonylphenol) presented concentrations consistent with previous studies and within the threshold of toxicity, except bisphenol A