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Environmental assessment of water-courses of the Turvo Limpo River basin at the Minas Gerais State, Brazil

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Abstract

A study was performed to evaluate the environmental contamination in the Turvo Limpo River basin which receives effluent discharges from domestic (residential and commercial) activities. The watercourses examined were the São Bartolomeu Stream, Turvo Sujo River, and Turvo Limpo River, located in the Minas Gerais State, Brazil. Water samples were collected at the river-side and analyzed for evaluation of pollutant inputs. The pH, temperature, electrical conductivity, redox potential (Eh), dissolved oxygen (DO), total and settleable solids, visual color, hardness, chemical oxygen demand (COD), biochemical oxygen demand (BOD), chloride, total phosphate, total nitrogen, ammonia nitrogen, nitrate, total coliforms and E. coli, as well as the Cd, Pb, Cu, and Zn speciation were determined in the watercourses. The data obtained were compared with those of the Brazilian Environmental Standards and with data from non-contaminated areas. River water characteristics in some sites were far from the limit values established for superficial waters with satisfactory quality. For instance, the BOD values reached 411 mg L−1 for a maximum limit of 10.0 mg L−1, while the ammonia nitrogen concentration reached 28 mg L−1 for a maximum limit of 13.3 mg L−1. Some sites showed E. coli values above those of non-contaminated regions. Besides the effects of sewage discharges into the water-courses, agriculture activities and the use of the area for cattle husbandry influenced the quality of the river waters, for instance, the pH of a spring-water sample reached the value of 4.3. The São Bartolomeu Stream has been contributing to the deterioration of the water quality of the Turvo Sujo River, while the Turvo Limpo River has also been affected by anthropogenic discharges in the Turvo Sujo River. The speciation of Cd, Cu and Pb showed that these metals were mainly found in the particulate fraction (i. e., associated with the suspended material). Fifty five percent of the water samples showed labile Zn concentrations greater than that of the nonlabile Zn.

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Authors and Affiliations

  1. Departamento de Solos, Universidade Federal de Viçosa, 36570-000, Viçosa, Minas Gerais, Brasil

    C. P. Jordão, R. B. A. Fernandes & R. L. F. Fontes

  2. Departamento de Química, Universidade Federal de Viçosa, 36570-000, Viçosa, Minas Gerais, Brasil

    P. R. S. Ribeiro

  3. Departamento de Engenharia Agrícola, Universidade Federal de Viçosa, 36570-000, Viçosa, Minas Gerais, Brasil

    A. T. Matos

  4. Departamento de Engenharia Civil, Universidade Federal de Viçosa, 36570-000, Viçosa, Minas Gerais, Brasil

    R. K. X. Bastos

Authors
  1. C. P. Jordão
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  2. P. R. S. Ribeiro
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  3. A. T. Matos
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  4. R. K. X. Bastos
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  5. R. B. A. Fernandes
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  6. R. L. F. Fontes
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Correspondence to C. P. Jordão.

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Jordão, C.P., Ribeiro, P.R.S., Matos, A.T. et al. Environmental assessment of water-courses of the Turvo Limpo River basin at the Minas Gerais State, Brazil. Environ Monit Assess 127, 315–326 (2007). https://doi.org/10.1007/s10661-006-9282-x

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  • DOI: https://doi.org/10.1007/s10661-006-9282-x

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