Diagnóstico da qualidade das águas do córrego Sucuri (Caçu-Goiás) (Diagnostic of the water quality of the stream Sucuri (Caçu-Goiás))
DOI:
https://doi.org/10.26848/rbgf.v10.4.p1312-1328Keywords:
Bacia Hidrográfica, Limnologia, Resolução CONAMA 357/2005Abstract
O presente estudo teve como objetivo analisar e diagnosticar a qualidade das águas do córrego Sucuri, localizado no município de Caçu-Goiás. Para tanto, delimitou-se como área de estudo a bacia do córrego Sucuri, que está inserida na bacia do reservatório da Usina Hidrelétrica Barra dos Coqueiro. Foram definidos cinco pontos de amostragem no curso d'água e as coletas foram realizadas em quatros períodos distintos. Parâmetros analisados: potencial Hidrogeniônico (pH), oxigênio dissolvido (OD), demanda bioquímica de oxigênio (DBO), temperatura da água (T), condutividade elétrica (CE), total de sólidos dissolvidos (TSD), salinidade (NaCl), coliformes termotolerantes (CT) e fósforo total (P). A metodologia de análise da água seguiu a proposta do Standard Methods for the Examination of Water and Wastewater e Resolução CONAMA (2005). De acordo com os dados avaliados, a não conformidade da água do córrego Sucuri para classe 1 é afetada pela CE, P e CT, sendo esse curso d'água classificado como de classes 2 e 3. Há correlações muito fortes entre os parâmetros TSD x NaCl = 0,9994, CE x NaCl = 0,9997 e CE x TSD =0,9999 e estão relacionadas as características física e geológicas da bacia e tipos de solo.
A B S T R A C T
The purpose of this study is to analyze and to evaluate the water quality of Sucuri stream, located in the municipality of Caçu-Goiás. For this purpose, it was established Sucuri stream basin, which is located in the reservoir basin of Barra dos Coqueiros Hydroelectric Power Plant, which was delimited as the study area. It was determined five sampling points in the watercourse, and the collections were carried out in four different periods. The parameters that were studied are: (DBO), water temperature (T), electrical conductivity (CE), total dissolved solids (TSD), salinity (NaCl), thermotolerant coliforms (CT) and total phosphorus (P). The methodology of water analysis followed the proposal of the Standard Methods for the Examination of Water and Wastewater and Resolution CONAMA (2005). According to the data, the non-conformance of the water of the Sucuri stream to class 1 is affected by the CE, P and CT, being this watercourse classified as class 2 and 3. There are very strong that the correlations between the parameters TSD, CE And NaCl are related to the physical and geological characteristics of the basin and soil types.
Keywords: hydrographic basin, limnology, CONAMA resolution 357/2005.
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Copyright (c) 2017 Assunção Andrade de Barcelos, Fernanda Ramalho, João Cabral, Wellmo Alves
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