Chronostratigraphy elucidates environmental changes in lacustrine sedimentation rates and metal accumulation

Autor(es)

Biamont-Rojas, Ivan Edward ; Cardoso-Silva, Sheila ; Ferreira, Paulo Alves de Lima ; Alfaro-Tapia, Rene ; Figueira, Rubens ; Pompeo, Marcelo

• Tipo de documento: Artigo Científico
• Fonte: Environmental Science and Pollution Research; v. 30, n. 28, p. 16-pg., 2023-05-12.

Resumo

All changes taking place in a watershed have repercussions on lacustrine environments, being these, the sink of all activities occurring in the basin. Lake Titicaca, the world's highest and navigable lake, is not unfamiliar with these phenomena that can alter the sedimentation dynamics and metal accumulation. This study aimed to identify temporal trends of sedimentation rates by employing a geochronological analysis (Pb-210, Cs-137) and to propose metal background values in Puno Bay, as well as to identify metal concentrations (As, Ba, Ca, Cr, Cu, K, Mg, Mo, Ni, Pb, Zn) in the projected timeline to propose, for the first time, background values in Puno Bay. Two sediment cores were collected from the outer and inner bays. Sediment rate (SR) was calculated through the excess of Pb-210 (Pb-210(xs)) applying the Constant Flux Constant Sedimentation (CFCS) model. Results show that SR in the outer bay was 0.48 +/- 0.08 cm a(-1) and for the inner bay was 0.64 +/- 0.07 cm a(-1). Sediment quality guidelines (SQGs) did not indicate toxicity was likely to occur, except for As. However, enrichment factors (EFs) indicated that all metal accumulation is geogenic. Climatic factors had a marked influence on sedimentation rates for the outer bay, and in the case of the inner bay, it was a sum of climatic and human-based factors. (AU)

• Processo FAPESP: 16/24528-2 - Metais em sedimentos de reservatórios paulistas: subsídio à tomada de decisões através de abordagens geoestatística e ecotoxicológica
• Beneficiário: Marcelo Luiz Martins Pompêo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/10845-4 - Qualidade da água de reservatórios paulistas: o peso das evidências
• Beneficiário: Marcelo Luiz Martins Pompêo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 21/10637-2 - Múltiplos olhares sobre a qualidade da água e do sedimento do reservatório de Barra Bonita (São Paulo): o peso das evidências
• Beneficiário: Marcelo Luiz Martins Pompêo
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 20/11759-1 - Um olhar sobre a qualidade das águas de reservatórios desde 786 km de altitude: imagens Sentinel 2
• Beneficiário: Marcelo Luiz Martins Pompêo
• Modalidade de apoio: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE