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Registro Completo |
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Biblioteca(s): |
Embrapa Clima Temperado. |
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Data corrente: |
28/08/1995 |
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Data da última atualização: |
28/08/1995 |
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Autoria: |
CORREIA, L. G. |
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Título: |
Efeito do sombreamento e de CCC (2- Cloreto de gloroetiltrimetilamonio) na formacao de mudas e na producao de pimentao (Capsicum annuum L.). |
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Ano de publicação: |
1977 |
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Fonte/Imprenta: |
Vicosa: UFV, 1977. |
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Páginas: |
40p. |
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Idioma: |
Português |
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Notas: |
Dissertacao de mestrado. |
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Thesagro: |
Pimentão. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00432nam a2200133 a 4500
001 1740722
005 1995-08-28
008 1977 bl uuuu m 00u1 u #d
100 1 $aCORREIA, L. G.
245 $aEfeito do sombreamento e de CCC (2- Cloreto de gloroetiltrimetilamonio) na formacao de mudas e na producao de pimentao (Capsicum annuum L.).
260 $aVicosa: UFV$c1977
300 $a40p.
500 $aDissertacao de mestrado.
650 $aPimentão
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Registro original: |
Embrapa Clima Temperado (CPACT) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Solos. Para informações adicionais entre em contato com cnps.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Solos. |
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Data corrente: |
08/03/2023 |
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Data da última atualização: |
13/03/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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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. |
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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. |
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Título: |
Effect of nanomaterials on the bioavailability of metals in sediments from a highly impacted tropical coastal environment. |
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Ano de publicação: |
2023 |
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Fonte/Imprenta: |
Environmental Nanotechnology, Monitoring & Management, v. 20, 100799, Dec. 2023. |
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DOI: |
https://doi.org/10.1016/j.enmm.2023.100799 |
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Idioma: |
Inglês |
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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. MenosIn 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 nanomateria... Mostrar Tudo |
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Palavras-Chave: |
Guanabara Bay; Microcosm assay; Polluted aquatic environment. |
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Thesaurus NAL: |
Metals; Nanoparticles; Organic matter. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02559naa a2200277 a 4500
001 2152181
005 2023-03-13
008 2023 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1016/j.enmm.2023.100799$2DOI
100 1 $aSILVA, M. M. da
245 $aEffect of nanomaterials on the bioavailability of metals in sediments from a highly impacted tropical coastal environment.$h[electronic resource]
260 $c2023
520 $aIn 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.
650 $aMetals
650 $aNanoparticles
650 $aOrganic matter
653 $aGuanabara Bay
653 $aMicrocosm assay
653 $aPolluted aquatic environment
700 1 $aWASSERMAN, M. A. V.
700 1 $aWASSERMAN, J. C. de F. A.
700 1 $aPEREZ, D. V.
700 1 $aPEREIRA, T. R.
700 1 $aBARRETO, M. B.
700 1 $aSANTOS-OLIVEIRA, R.
773 $tEnvironmental Nanotechnology, Monitoring & Management$gv. 20, 100799, Dec. 2023.
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