The Guanabara Bay (GB) concentrates approximately 70% of the industries of the State of Rio de Janeiro. The discharges of industrial effluents and residues, together with the domestic sewage, have caused this region to be of the most polluted areas of the Brazilian coast. The present project aims to assess the availability of contaminants from sediments from GB and estimate their toxic effects to the biota. Sediment samples will be collected in four different sites from GB, and will be analyzed for texture, organic matter and CaCO3 contents. Chemical analysis will consist in determination of metals by the Acid-Volatile Sulfides / Simultaneously Extracted Metals (AVS/SEM) approach. Samples will also be tested for both acute and chronic toxicity with the amphipod Tiburonella viscana and the copepod Nitocra sp, respectively. Bioaccumulation tests carried out with the clam Anomalocardia brasiliana. Toxicity Identification and Evaluation (TIE) will be used to determine the causes of toxicity. These lines of evidence will be used into a framework to assess ecological risks in GB, which includes assessing the sediment quality, estimating contaminants bioavailability and toxic potential, and addressing the causes of toxicity. Integration of the produced data will provide information on the ecological risks in GB and will be helpful to stakeholders and decision makers.
News published in Agência FAPESP Newsletter about the scholarship: