Journal
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Volume 23, Issue 7, Pages 1265-1273Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0103-50532012000700010
Keywords
Guanabara Bay; sediment dating; heavy metals; siltation; Pb-210
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Funding
- Instituto Nacional de Ciencia e Tecnologia-Transferencia de Massa Continente Oceano
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Three sediment cores were taken from Guanabara Bay. Two of them yielded Pb-210 profiles that could be applied for dating purposes. Actual sedimentation rates of approximately 1 cm year(-1) (five times higher than the baseline values) were observed for both sediment cores, which agree with the reviewed existing data in the literature related to Guanabara Bay sedimentation rates based on Pb-210. Dating validation was carried out based on the chromium, copper and lead profiles, on the Pb-210 flux and on the historical record of the main physical interventions occurring in the last century, such as embankment, the channeling of main rivers and the construction of express roads. At the end of this process, only one sediment core dating could be adequately validated.
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