Data/hora: 16/06/2024 04:38:27

Biblioteca(s): | Embrapa Solos.
Data corrente: | 08/03/2023
Data da última atualização: | 13/03/2023
Autoria: | SILVA, M. M. da; WASSERMAN, M. A. V.; WASSERMAN, J. C. de F. A.; PEREZ, D. V.; PEREIRA, T. R.; BARRETO, M. B.; SANTOS-OLIVEIRA, R.
Afiliação: | MICHELE MARIA DA SILVA, COMISSÃO NACIONAL DE ENERGIA NUCLEAR; MARIA ANGÉLICA VERGARA WASSERMAN, COMISSÃO NACIONAL DE ENERGIA NUCLEAR; JÚLIO CESAR DE FARIA ALVIM WASSERMAN, UNIVERSIDADE FEDERAL FLUMINENSE; DANIEL VIDAL PEREZ, CNPS; TATIANE ROCHA PEREIRA, COMISSÃO NACIONAL DE ENERGIA NUCLEAR; MANUELLA BORGES BARRETO, COMISSÃO NACIONAL DE ENERGIA NUCLEAR; RALPH SANTOS-OLIVEIRA, INSTITUTO DE ENGENHARIA NUCLEAR.
Título: | Effect of nanomaterials on the bioavailability of metals in sediments from a highly impacted tropical coastal environment.
Ano de publicação: | 2023
Fonte/Imprenta: | Environmental Nanotechnology, Monitoring & Management, v. 20, 100799, Dec. 2023.
DOI: | https://doi.org/10.1016/j.enmm.2023.100799
Idioma: | Inglês
Conteúdo: | In this study, the impact of nanoparticles on the chemical behavior of metals in a tropical coastal environment was evaluated in a microcosm assay. The microcosms were assembled to reproduce the original environmental conditions, to evaluate the effects of two different nanoparticles. The aquariums were filled with water and sediment from Cunha River (Rio de Janeiro - Brazil) - which is highly contaminated by metals and organic compounds - and nanoparticles of hydroxyapatite (500 nm) and poly lactic-co-glycolic acid (PLGA) nanoparticles doped with Holmium-166 (200 nm), both radiolabeled with 99mTc. The quantification of trace metals (Cu, Zn, Mn, Fe, Cr and Pb) was performed in the water samples. The concentration data obtained for Fe, Cr and Pb were lower than ICP-OES Detection Limits (Fe: DL < 0.0343 mg.L-1, Cr: DL < 0.0036 mg.L-1 and Pb: DL < 0.0291 mg.L-1), while the results for Cu, Zn and Mn demonstrated that the presence of hydroxyapatite and PLGA nanoparticles had no influence on the behavior of dissolved metals, probably because of the high organic loads of the system, which may have overwhelmed or masked the interaction of nanomaterials with metals, once the natural organic matter could interact with the nanoparticles, favoring their aggregation and sedimentation and thus reducing their bioavailability and reactivity. Geochemical fractionation presented a relevant association of metals with the organic phase. In terms of environmental impact assessment of nanomaterials, it was concluded through 99mTc labelling that both nanomaterials (about 30% to 50%) remained in solution during the 49 h of the experiment.
Palavras-Chave: | Guanabara Bay; Microcosm assay; Polluted aquatic environment.
Thesaurus Nal: | Metals; Nanoparticles; Organic matter.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Solos (CNPS)
Exemplares: | CNPS - (21249-1) - UPC - AP - DD -  -  -  - DIS