Três testemunhos sedimentares foram coletados na Baía de Guanabara. Dois deles apresentaram perfis de concentração de 210 Pb que poderiam ser utilizados para fins de datação. Taxas de sedimentação de aproximadamente 1 cm ano -1 (cinco vezes superior aos valores de linha de base) foram observadas para os dois testemunhos, coerentes com os dados existentes na literatura relacionada à datação de sedimentos da Baía de Guanabara, empregando-se 210 Pb. A validação da datação foi realizada com base nos perfis de cobre, cromo e chumbo, no fluxo de 210 Pb e no registro histórico das principais intervenções físicas ocorridas no século passado, tais como aterro, a canalização de rios principais e a construção de vias rápidas. No final deste processo, apenas a datação de um único testemunho pôde ser adequadamente validada.Three sediment cores were taken from Guanabara Bay. Two of them yielded 210 Pb 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 210 Pb. Dating validation was carried out based on the chromium, copper and lead profiles, on the 210 Pb 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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