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Avaliação da toxicidade em água e sedimento do rio Cubatão-SP
| Content Provider | Semantic Scholar |
|---|---|
| Author | Garcia, Vanessa Silva Granadeiro |
| Copyright Year | 2012 |
| Abstract | The monitoring of water quality on rivers where wastewaters are discharged may be important for the general conservation once many pollutants may alter the ecosystem balance, and life functioning. To study sediments contamination is an important tool that allows a more comprehensive assessment of the aquatic ecosystem, since many contaminants can be associated to the sediment in higher concentrations than in water and may result in negative impacts on aquatic biota. The Cubatão district is one of the largest industrial centers of Brazil. The usual discharge of industrial effluents and domestic sewage into Cubatão and its tributaries ended up causing serious waterways degradation. Cubatão River Basin is located between São Paulo and Baixada Santista (coast), covering approximately 177km area. Cubatão River as the main water source for the region, suppling water to Cubatão and its industrial area, and also to Santos, São Vicente and partially to Praia Grande and Guarujá municipalities. The objective of this study was to assess the toxicity for aquatic organisms concerning water and sediment sampled at Cubatão and at two tributaries (Perequê and Pilões). Chemical determinations were included in order to try identify the possible relation between biological effecs. Ceriodaphnia dubia and Vibrio fischeri were used for evaluation of water effects while Hyalella azteca were exposed to the sediments. Biometric analysis were performed on Hyalella azteca. Furthermore, chemical identification by Chromatography and Neutron Activation Analysis were carried out in sediment samples. Through V. fischeri toxicity response it could be noted signs of effects once the EC(I)50 ranged from 31.25% up to 71.61%. C. dubia results were negative to the same samples, based on statistical analysis (test "t" for bioequivalence).Through acute toxicity responses when H. azteca was exposed to sediments, toxicity was identified in samples from P2 and P5 (2nd and 4th campaigns): mortality exceeding 50% of exposed organisms. The biometric analysis for the H. azteca growth showed lower values for organisms exposed to sediments from P4 and P5. Chemical analysis evidenced endrin, dibenzo(a, h) anthracene and anthracene at sediments from P5, values which are not in accordance with the Conama 344/04; Neutron Activation Analysis showed high concentrations of metals for samples from the sites P5 and PI. |
| File Format | PDF HTM / HTML |
| DOI | 10.11606/D.85.2012.tde-24082012-132649 |
| Alternate Webpage(s) | https://teses.usp.br/teses/disponiveis/85/85131/tde-24082012-132649/publico/2012GarciaAvaliacao.pdf |
| Alternate Webpage(s) | http://pelicano.ipen.br/PosG30/TextoCompleto/Vanessa%20Silva%20Granadeiro%20Garcia_M.pdf |
| Alternate Webpage(s) | https://doi.org/10.11606/D.85.2012.tde-24082012-132649 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
