| Texto completo | |
| Autor(es): |
Pauly, Guacira de Figueiredo Eufrasio
;
Perina, Fernando Cesar
;
Yamamoto, Flavia Yoshie
;
Kim, Bianca Sung Mi
;
Trevizani, Tailisi Hoppe
;
Cruz, Ana Carolina Feitosa
;
Ribeiro, Caio Cesar
;
Menezes, Luciana
;
Figueira, Rubens Cesar Lopes
;
Abessa, Denis Moledo de Souza
Número total de Autores: 10
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ENVIRONMENTAL MONITORING AND ASSESSMENT; v. 196, n. 3, p. 21-pg., 2024-03-01. |
| Resumo | |
In November 2015, the Fundao Dam break released millions of tons of metal-rich tailings into the Doce River Basin (DRB), causing catastrophic damage and potential ecological effects that reached the Atlantic Ocean. This study aimed to evaluate the geochemistry and toxicity of water and sediments collected in the DRB from 2015 to 2019 and to determine the spatial and temporal trends. Water and sediment samples were analyzed for metals and As by inductively coupled plasma optical emission spectrometry (ICP-OES), and acute toxicity for Daphnia similis or D. magna. Results were explored using geochemical indices and correlation analyzes. Overall, higher concentrations of metals and As in water and sediments were observed immediately after dam breakage, but the levels exhibited a decreasing trend over time, although the levels of some elements such as As and Mn remained high in the upper DRB. The geochemical indices indicated mostly low to moderate contamination, and the enrichment factor (EF) demonstrated a higher enrichment of Mn in the upper DRB. Acute toxicity to water fleas (D. similis and D. magna) was occasionally observed in waters and sediments, but the reference samples were toxic, and the short-term effects were not correlated with metals and As. Overall, the results showed limited bioavailability of metals and As and a decreasing trend in their concentrations, indicating an ongoing recovery process in DRB. These results are important to decision-making regarding the disaster and actions for environmental restoration. (AU) | |
| Processo FAPESP: | 18/23279-4 - Além das medições convencionais: avaliação de efeitos tóxicos em Danio rerio e Corbicula fluminea associados a água e sedimentos contaminados por rejeitos de mineração, liberados após o acidente com a Barragem do Fundão no Rio Doce (ES - MG) |
| Beneficiário: | Guacira de Figueiredo Eufrasio Pauly |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 16/15229-1 - Avaliação da toxicidade dos poluentes presentes no Rio Doce após rompimento da Barragem do Fundão (MG) através de diferentes biomarcadores em peixes |
| Beneficiário: | Flávia Yoshie Yamamoto |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |