| Texto completo | |
| Autor(es): |
Mariano, Gabriel
;
Magro, Camila
;
Urbanski, Bruna Quirici
;
Nogueira, Marcos Gomes
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ENVIRONMENTAL MONITORING AND ASSESSMENT; v. 197, n. 4, p. 15-pg., 2025-03-12. |
| Resumo | |
Most domestic and industrial waste, along with plastic litter from S & atilde;o Paulo city, flows into the Tiet & ecirc; River. Microplastics (MPs) from water column and sediment samples of the Tiet & ecirc; River, a marginal lagoon, and Peixe River (tributary) were analyzed to verify microplastic contamination downstream the S & atilde;o Paulo metropolitan region. Water samples were collected after the rainy season (April 2021) and during the dry season (August 2021), with a plankton net. Sediment samples were collected only in April 2021, with a dredge. Samples were submitted to wet peroxidation (H2O2 + Fe (II) at 70 degrees C) and then passed through metal sieves (minimum 0.053 mm, maximum 4 mm). Microscopic counting characterized microplastic size, form, and color. mu FTIR analysis was performed to verify particle chemical composition. For water, there was an increasing gradient of MPs: Peixe River < Tiet & ecirc; lagoon < Tiet & ecirc; River. For sediments, contamination in the main river and the marginal lagoon is of the same magnitude (10(5) MPs/kg). Size, form, and color proportions were similar when comparing the water and sediment. Small-sized transparent and blue fibers predominated. The main types of polymers were PET (23.5%), followed by HDPE, polyester, and polyethylene (14.7% each). The lentic condition of the lagoon did not increase particles in the sediment when compared to the main river. Contamination in the Tiet & ecirc; River water column was higher after the rains in S & atilde;o Paulo even 300 km downstream. Integrated water-sediment analyses were important to understand distinct processes on both spatial and temporal scales. (AU) | |
| Processo FAPESP: | 19/00177-4 - Barreira química para a dispersão da ictiofauna: uma análise do rio Tietê e seus tributários |
| Beneficiário: | Bruna Quirici Urbanski |
| Modalidade de apoio: | Bolsas no Brasil - Mestrado |