Comparative Study of Sediment Quality From the Tietê River Reservoirs (SP)
DOI:
https://doi.org/10.5132/jbse.2006.02.010Keywords:
Tietê reservoirs, sediment qualityAbstract
There is a general consensus that the sediment from water bodies plays a fundamental role in the transport dynamics, accumulation and availability of pollutants. In the sediments quality triad, considered one of the best approaches for the study of anthropogenic contaminated aquatic systems, the chemical and biological data (bioassays and benthic community analysis) are combined to show the degradation of each site. The RTM (ratio to maximum value) values provide useful visual information, because they can be plotted in axes with common origin. Therefore, a relative measure of sediment degradation can be obtained, by calculating the area formed by the figure obtained for each station or site. This comparative design of study was applied as an alternative to the multivariate analyses (PCA, Cluster, etc.) to the data obtained by the Qualised project – Technical-Scientific Bases For the Development of Sediment Quality Criteria – for the 2000 to 2001 period. The results allow the classification of the reservoirs based on their respective sediment quality and indicate the degradation vectors they are subject to. The spatial distribution of sediments potentially toxic accompanies the trophic gradient of Tietê River, i.e., the downstream reservoirs are less eutrophicated than the upstream ones. Therefore, the quality of the sediments improves with the distance from the metropolitan area of São Paulo confirming the origin of most of pollutant substances. The sediments of Rasgão and Billings reservoirs were considered those with lower quality, while those from Promissão reservoir present a better condition.
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