The concentration of Cd in sediment was significantly higher
than the concentration of Cd in water because heavy metals must
Fig. 6. Distribution of Pb concentration in the Cunha Canal watershed and the western side of Guanabara Bay during the rainy and dry seasons.
Fig. 7. Distribution of Cu concentrations in the Cunha Canal watershed and on the eastern side of Guanabara Bay during the rainy and dry seasons.
80 R.C. Borges et al. / Marine Pollution Bulletin 89 (2014) 75–84
interact with fine sediments in suspension when released into the
aquatic environment and are subsequently removed from the
water column. This removal is only temporary; the sediment is
subjected to reworking by chemical, physical and biological processes.
This reworking is natural (erosion, diagenesis or bioturbation)
and/or anthropogenic (dredging)