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Title: Estimativa dos fluxos de Zn, CD, Pb e Cu no Saco do Engenho, Baía de Sepetiba, RJ
Keywords: Contaminação ambiental;  Metais pesados;  Rejeitos industriais;  Environmental contamination;  Heavy metals;  Industrial waste
Issue Date: 22-Feb-2010
Abstract: This study quantified the superficial aquatic aport of Zn, Cd, Pb, e Cu at Sepetiba Bay, derivative from Engenho Inlet, to look for the daily values of trace metals pollution, mostly originated of a large environmental liabilitie in that place, the tailing of old bankrupt Cia. Ingá Mercantil. The results show how concern is the load of metal contaminants that are still exported to the Sepetiba Bay through the Engenho Inlet, due to the joint process of leaching and erosion of industrial wastes rich in heavy metals. Zn and Cd were characterized as the main metals that are leached from the tailings by the action of the waters of the Bay and local rains, and then the metals that pose the greatest risks to the local aquatic environment, especially if this fact is added to their high concentrations to reject. In the analysis performed, in 71% of the samples, the concentration of Zn total exceeded the maximum allowable for Waters Class 2, according to Brazilian environmental legislation. Comparing our results with other regions, the concentrations of Zn, Cd, Pb, and Cu found in the waters of Engenho Inlet are comparable to concentrations found in other areas highly impacted by industrial and portuary activities. The results for the flow of contaminants who come to Sepetiba Bay from the Engenho Inlet were 33 t.year-1 of Zn, 0.3 t.year-1 of Cd and 0.06 t.year-1 of Pb. The metal Cu showed a flow of 0.51 t.ano-1, but in reverse flux. Zn and Cd showed higher anual flow values, or at least the same order of magnitude, than those found in the Canal of San Francisco and Rio Guandu rivers, these highly contaminated by heavy metals, especially in its final stretches due to high concentration of industries with high pollution potential, and have an annual flow of about 100 times greater than the highest value of flow measured in the Engenho Inlet.
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