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To obtain baseline data for improving the monitoring of the expected increase in anthropogenic impacts from surrounding drainage basins, a multivariate analysis of data from different sediment layers was carried out to evaluate the dated sediment record.
The geochemical data suggested three different sedimentary phases along the last 200 years.
Before the 1880s, the highest clay and TOC contents were observed, where the C/N ratios and the δC values suggested a mixture of algal and terrestrial organic matter and the lowest concentrations of Co, Cu, Pb, V and Zn, for which background levels were estimated (4.6, 2.7, 14.9, 24.3 and 70.2 mg kg, respectively).
From the 1880s to the 1950s, the metal concentrations and sand particles increased, but no change in organic matter quality was observed, reflecting a period of land use change, still without significant sewage input.
RIO DE JANEIRO (AP) — Olympic sailors competing in the Rio de Janeiro may navigate through fetid waters and possibly bump into floating trash.