which is most likely due to the large organic loads
received by the Canal do Cunha basin and the western side of
Guanabara Bay and the elevated percentage of fine aggregates contained
in the sediment, which promote metal adsorption without
contaminating the waters or reaching the food chain.
The sampling points in the Canal do Cunha basin show higher
concentrations of Pb, Cu, Cd and Zn in water during both seasons
(rainy and dry) compared with the sampling points in Guanabara
Bay.