Water quality and ecotoxicity assessment in surface waters from Cubatão River and surroundings, São Paulo, Brazil
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2017
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Journal of Water Resource and Protection
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Resumo
The monitoring of water bodies means the attempt of protecting vulnerable
groups of organisms inhabiting streams and rivers. Industrial and domestic
discharges may worsen the water quality and affect biological balance, structure
and the functioning of the ecosystem. Cubatão City, is one of the largest
industrial centers in Brazil and in Latin America, where the constant discharge
of effluents into Cubatão River and its tributaries caused a degradation
scenario in the hydrographic basin of the region. The objective of this study
was to evaluate the acute and chronic effects of surface water from Cubatão
River and two of its tributaries (Perequê and Pilões) by ecotoxicological assays.
In addition, physical chemical parameters were analyzed. Ceriodaphnia
dubia and Vibrio fischeri were exposed-organisms during the studied period.
The study was conducted between 2010 and 2011 in four campaigns and nine
sites along the basin of Cubatão River. The ecotoxicity was measured by Vibrio
fischeri bioluminescence, EC50 values ranging from 31.25% to 71.61%. In
contrast, based on a bioequivalence t-test statistical analysis, the results obtained
with Ceriodaphnia dubia revealed no toxicity in the sampling sites. A
critical analysis of raw data of luminescence was carried out showing higher
values during the 2nd campaign. From the numbers obtained for physical-
chemical parameters P5 was far the worst due to chlorides, hardness and
conductivity. From the Pearson correlation analysis carried out with toxicity
to V. fischeri and the physical chemical parameters, the dissolved oxygen in
water resulted in a moderate positive correlation. Sediment contamination
was also demonstrated in the region.
Como referenciar
GARCIA, VANESSA S.G.; MATSUSHITA, EDUARDO T.D.; MESQUITA, LETICIA C.A.; FAVARO, DEBORAH I.T.; BORRELY, SUELI I. Water quality and ecotoxicity assessment in surface waters from Cubatão River and surroundings, São Paulo, Brazil. Journal of Water Resource and Protection, v. 09, n. 12, p. 1510-1525, 2017. DOI: 10.4236/jwarp.2017.912096. Disponível em: http://repositorio.ipen.br/handle/123456789/28514. Acesso em: 19 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.