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Abstract(s)
A Ribeira da Goldra e a Ribeira da Carpinteira descem da Serra da Estrela e
atravessam a cidade da Covilhã. Estas ribeiras tiveram uma importância muito
significativa no desenvolvimento industrial desta cidade pois possuíam uma água pura e
com um caudal abundante que se adaptava ao tratamento das lãs, e forneciam a energia
hidráulica que permitia o laborar das fábricas [1]. No entanto, ao longo do tempo estas
ribeiras foram ficando poluídas apresentando nos últimos anos um aspecto bastante
desagradável.
Um dos objectivos do programa POLIS foi a despoluição destas ribeiras. Para
conhecer o seu grau de poluição foram feitas, entre 2004 e 2006, análises à sua água.
Este trabalho teve como objectivo a monitorização de alguns parâmetros da água
destas ribeiras de modo a poder compará-los com os obtidos no âmbito do programa
POLIS. Os parâmetros monitorizados foram o fósforo, o cloreto e os metais, cádmio,
cobre e zinco.
Para poder monitorizar os parâmetros referidos foram feitas colheitas de água
nos mesmos pontos seleccionados pelo programa POLIS.
Os métodos analíticos aplicados foram a espectrofotometria de absorção
molecular associada a um sistema de fluxo segmentado para a determinação de fósforo,
a espectrofotometria de absorção atómica para a determinação dos metais e as técnicas
de cromatografia iónica e volumetria para a determinação de cloreto.
Os resultados obtidos permitiram fazer uma análise comparativa com os já
existentes. Com esta análise foi possível avaliar a evolução quantitativa, destes
parâmetros ao longo do tempo.
Visto terem sido aplicados dois métodos diferentes para a determinação do
cloreto, cromatografia iónica e volumetria, fez-se a comparação estatística destes dois
métodos analíticos.
Goldra and Carpinteira River down Estrela hill and cross Covilhã City. Those rivers had a very significant importance to the industrial development of this city because they had pure water and with an abundant flow that suited to the wools treatment and provided hydro energy which allowed the labor of factories [1]. However over time these rivers have been polluted, showing in recent years an aspect very unpleasant. One of the objectives of POLIS program was the depollution of these rivers. To know their degree of pollution were done, between 2004 e 2006, analyses of their water. This assignment had as objective, the monitoring of some parameters of the water from the rivers referred, in order to compare them with those obtained under the POLIS program. The parameters monitored were the phosphorous, chloride and the metals, cadmium, copper and zinc. To monitor the above parameters, were taken samples of water at the same points selected by the POLIS program. The analytical methods were applied to Molecular absorption spectrophotometry associated to a segmented-flow system for the determination of phosphorus, the atomic absorption spectrophotometry, for the determination of the metals and the techniques of ionic chromatography and volumetry for chloride determination. The results obtained, allowed to make a comparative analysis with the existing ones. With this comparative analysis was possible to evaluate the quantitative development, over time, of these parameters. Seeing as they have been applied two different methods for the chloride determination, ionic chromatography and volumetry, made up the statistic comparison of these two analytical methods.
Goldra and Carpinteira River down Estrela hill and cross Covilhã City. Those rivers had a very significant importance to the industrial development of this city because they had pure water and with an abundant flow that suited to the wools treatment and provided hydro energy which allowed the labor of factories [1]. However over time these rivers have been polluted, showing in recent years an aspect very unpleasant. One of the objectives of POLIS program was the depollution of these rivers. To know their degree of pollution were done, between 2004 e 2006, analyses of their water. This assignment had as objective, the monitoring of some parameters of the water from the rivers referred, in order to compare them with those obtained under the POLIS program. The parameters monitored were the phosphorous, chloride and the metals, cadmium, copper and zinc. To monitor the above parameters, were taken samples of water at the same points selected by the POLIS program. The analytical methods were applied to Molecular absorption spectrophotometry associated to a segmented-flow system for the determination of phosphorus, the atomic absorption spectrophotometry, for the determination of the metals and the techniques of ionic chromatography and volumetry for chloride determination. The results obtained, allowed to make a comparative analysis with the existing ones. With this comparative analysis was possible to evaluate the quantitative development, over time, of these parameters. Seeing as they have been applied two different methods for the chloride determination, ionic chromatography and volumetry, made up the statistic comparison of these two analytical methods.