Estudo de metais pesados em sedimentos de fundo na região de Foz em afluentes do reservatório de Itaipu
The discharge of industrial effluents, agricultural, soil entrainment, absence of adequate sewage treatment and solid waste are potential sources contributing to the increase metals concentrations in sediments. The sediments are reservoirs of a variety of substances, are extensively used with pollut...
| Autor principal: | Lopes, Thiara Reis |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/12585 |
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| Resumo: |
The discharge of industrial effluents, agricultural, soil entrainment, absence of adequate sewage treatment and solid waste are potential sources contributing to the increase metals concentrations in sediments. The sediments are reservoirs of a variety of substances, are extensively used with pollution indicators in aquatic environments, for reflecting the environmental characteristics both in the sample time as the remote memory in the aquatic environment in study. The purpose of this study was to determine the physicochemical characterization and evaluate the concentration of metals in sediments from the rivers mouth region in four of the main tributaries of the Itaipu reservoir. Were realized three campaigns from February 2014 to March 2015, the bottom sediment rates were collected using dredge of type Petersen. The determinations of metals was realized by FAAS and others physicochemical parameters by using gravimetric and potentiometric techniques. Regarding the physical and chemical parameters, the sediments studied showed neutral character to slightly alkaline, have relatively homogeneous pH. Concentrations of STV is higher at point 4, followed by point 1 and 2. The highest concentration of STV can have contributed to the retention of metals in these sediments. About the grain size of the sediment, was observed the predominance of clay fraction. Point 3, showed the smallest fraction of clay, only 22%, and also the lowest concentrations of metals. In the disponible fraction, only the copper has reached higher concentrations than the level TEL (values below which adverse effects are rarely expected) at all sampling points. In the pseudo-total fraction, in some points, the concentrations for some metals can cause risks to environmental quality, according to international criteria sediment classification adopted by the National Oceanic and Atmosferic Administration (NOAA). The method of multivariate principal component analysis (PCA) was useful in the correlation between the sample points and the interaction between the physical and chemical variables and fractions studied metals. These results can contribute with informations for future research in this region. |
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