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Registro Completo
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
06/04/2017 |
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Data da última atualização: |
01/08/2017 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
CLEMENTE, Z.; CASTRO, V. L. S. S. de; FRANQUI, L.; SILVA, C. A.; MARTINEZ, D. S. T. |
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Afiliação: |
ZAIRA CLEMENTE, CNPEM; VERA LUCIA SCHERHOLZ S DE CASTRO, CNPMA; LIDIANE FRANQUI, CNPEM; CRISTIANE A. SILVA, CNPEM; DIEGO STEFANI TEODORO MARTINEZ, CNPEM. |
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Título: |
Evaluating the graphene oxide dispersions for fish embryo toxicity (FET) test. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
In: ENCONTRO ANUAL DA SOCIEDADE BRASILEIRA DE PESQUISA EM MATERIAIS, 15., 2016, Campinas. [Abstracts...] Rio de Janeiro: Sociedade Brasileira de Pesquisas em Materiais, 2016. Resumo B6E2. |
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Idioma: |
Português |
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Conteúdo: |
The Fish Embryo Toxicity (FET) test has wide utilization in nanoecotoxicology. However, some difficulties have been found related to the aggregation and precipitation of nanomaterials in exposure medium and the contrasting results among studies due to differences in the material characteristics. Furthermore, abiotic factors as the presence of organic matter can influence the test evaluation. The aim of this study was to evaluate and characterize the effect of the humic acid presence in the stability of two types of graphene oxide dispersion in an exposure medium used in FET test. Stock-suspensions (1.0 mg mL-1) of GO (sigma Aldrich, flakes) or base-washed GO (bwGO) and humic acid (HA sodium salt, Sigma Aldrich) were prepared in ultrapure water (UW). They were sonicated before preparing the GO or bwGO test suspensions at 100.0 µg mL-1 in UW and reconstituted water (RW, pH 8±0.2, 425±129 µS/cm), with HA (20.0 µg mL-1)or not. The samples were incubated during 96h at 26oC. The GO and bwGO and its dispersions were characterized through the following techniques: spectrophotometry, centrifugation, dynamic light scattering (DLS), nanoparticle tracking analysis (NTA), thermogravimetry (TGA), and X-ray photoelectron spectrometry (XPS). The results showed that materials aggregated and precipitated quickly in RW, but in the presence of HA the stability was similar to that found in UW. The aggregation and precipitation of bwGO was more intense than that of GO. The bwGO showed a great particle sizes heterogeneity than GO, in any condition tested. The different behavior can be related to the less presence of oxygenated groups in bwGO regards to GO. These results showed that surface characteristic of GO and the presence of HA influence the GO behavior in exposure medium and support the use of HA as a natural dispersant to graphene oxide in FET test. MenosThe Fish Embryo Toxicity (FET) test has wide utilization in nanoecotoxicology. However, some difficulties have been found related to the aggregation and precipitation of nanomaterials in exposure medium and the contrasting results among studies due to differences in the material characteristics. Furthermore, abiotic factors as the presence of organic matter can influence the test evaluation. The aim of this study was to evaluate and characterize the effect of the humic acid presence in the stability of two types of graphene oxide dispersion in an exposure medium used in FET test. Stock-suspensions (1.0 mg mL-1) of GO (sigma Aldrich, flakes) or base-washed GO (bwGO) and humic acid (HA sodium salt, Sigma Aldrich) were prepared in ultrapure water (UW). They were sonicated before preparing the GO or bwGO test suspensions at 100.0 µg mL-1 in UW and reconstituted water (RW, pH 8±0.2, 425±129 µS/cm), with HA (20.0 µg mL-1)or not. The samples were incubated during 96h at 26oC. The GO and bwGO and its dispersions were characterized through the following techniques: spectrophotometry, centrifugation, dynamic light scattering (DLS), nanoparticle tracking analysis (NTA), thermogravimetry (TGA), and X-ray photoelectron spectrometry (XPS). The results showed that materials aggregated and precipitated quickly in RW, but in the presence of HA the stability was similar to that found in UW. The aggregation and precipitation of bwGO was more intense than that of GO. The bwGO showed a great par... Mostrar Tudo |
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Palavras-Chave: |
Ecotoxicologia; FET test. |
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Thesagro: |
Peixe. |
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Thesaurus NAL: |
Graphene. |
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Categoria do assunto: |
W Química e Física |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/161194/1/2016RA-041.pdf
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Marc: |
LEADER 02600nam a2200205 a 4500
001 2068204
005 2017-08-01
008 2016 bl uuuu u00u1 u #d
100 1 $aCLEMENTE, Z.
245 $aEvaluating the graphene oxide dispersions for fish embryo toxicity (FET) test.$h[electronic resource]
260 $aIn: ENCONTRO ANUAL DA SOCIEDADE BRASILEIRA DE PESQUISA EM MATERIAIS, 15., 2016, Campinas. [Abstracts...] Rio de Janeiro: Sociedade Brasileira de Pesquisas em Materiais, 2016. Resumo B6E2.$c2016
520 $aThe Fish Embryo Toxicity (FET) test has wide utilization in nanoecotoxicology. However, some difficulties have been found related to the aggregation and precipitation of nanomaterials in exposure medium and the contrasting results among studies due to differences in the material characteristics. Furthermore, abiotic factors as the presence of organic matter can influence the test evaluation. The aim of this study was to evaluate and characterize the effect of the humic acid presence in the stability of two types of graphene oxide dispersion in an exposure medium used in FET test. Stock-suspensions (1.0 mg mL-1) of GO (sigma Aldrich, flakes) or base-washed GO (bwGO) and humic acid (HA sodium salt, Sigma Aldrich) were prepared in ultrapure water (UW). They were sonicated before preparing the GO or bwGO test suspensions at 100.0 µg mL-1 in UW and reconstituted water (RW, pH 8±0.2, 425±129 µS/cm), with HA (20.0 µg mL-1)or not. The samples were incubated during 96h at 26oC. The GO and bwGO and its dispersions were characterized through the following techniques: spectrophotometry, centrifugation, dynamic light scattering (DLS), nanoparticle tracking analysis (NTA), thermogravimetry (TGA), and X-ray photoelectron spectrometry (XPS). The results showed that materials aggregated and precipitated quickly in RW, but in the presence of HA the stability was similar to that found in UW. The aggregation and precipitation of bwGO was more intense than that of GO. The bwGO showed a great particle sizes heterogeneity than GO, in any condition tested. The different behavior can be related to the less presence of oxygenated groups in bwGO regards to GO. These results showed that surface characteristic of GO and the presence of HA influence the GO behavior in exposure medium and support the use of HA as a natural dispersant to graphene oxide in FET test.
650 $aGraphene
650 $aPeixe
653 $aEcotoxicologia
653 $aFET test
700 1 $aCASTRO, V. L. S. S. de
700 1 $aFRANQUI, L.
700 1 $aSILVA, C. A.
700 1 $aMARTINEZ, D. S. T.
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Registro original: |
Embrapa Meio Ambiente (CNPMA) |
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Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
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Registro completo
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Biblioteca(s): |
Catálogo Coletivo de Periódicos Embrapa; Embrapa Acre; Embrapa Caprinos e Ovinos; Embrapa Gado de Corte; Embrapa Gado de Leite; Embrapa Suínos e Aves. |
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Identificador: |
122 |
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Data corrente: |
09/05/2002 |
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Data da última atualização: |
04/05/2015 |
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Código do título: |
1600071 |
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ISSN: |
0044-605X |
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Código CCN: |
001215-7 |
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Título e Subtítulo: |
ACTA VETERINARIA SCANDINAVICA |
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Entidade: |
Societatum Veteranariarum Scandinivacarum |
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Local de publicação: |
Copenhagen, DK |
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Periodicidade: |
Trimestral |
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Inicio de publicação: |
1959 |
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Coleções da unidade: |
Embrapa Acre
1980-91 21-32; 1994 35 (1); 36 (4); 1997 38 (3)
Classificação: 636.08905
Embrapa Caprinos e Ovinos
1976 17(1-2,4); 1977 18(1-4); 1978 19(1-4); 1979 20(1-4); 1980 21(1-4); 1981 22(1-4); 1982 23(1-4); 1983 24(1-4); 1984 25(1-4); 1985 26(1-4); 1986 27(1-4); 1987 28(1-4); 1988 29(1-4); 1989 30(1-4); 1992 33(1-4); 1993 34(1-4); 1994 35(1-4); 1995 36(1-4); 1996 37(1-4); 1997 38(1-3); 1998 39(1).
Embrapa Gado de Corte
1977-91 18-32; 1993-98 34-39;
Classificação: 636.08905
Embrapa Gado de Leite
1959 1(1); 1960 1(2); 1977/91 18-32; 1993/98 34-39 + Supl. 54-56,60,62-81,83-87,89-90
Classificação: 636.08905
Embrapa Suínos e Aves
1959 1(1); 1960 1(2,4); 1970 11; 1971 12; 1972 13; 1973 14; 1974 15; 1975 16; 1976 17(1-2,4); 1977 18; 1978 19; 1979 20; 1980 21; 1981 22; 1982 23; 1983 24; 1984 25; 1985 26; 1986 27; 1987 28(1-4); 1988 29(1-4); 1989 30(1-4); 1990 31(1-4); 1991 32(1-4); 1993 34(4); 1994 35(1-4); 1995 36(1-4); 1996 37(1-4); 1997 38(1-4); 1998 39(1-4); 2000 41(1-4, supl 93); 2001 42(1-4,supl 94-95); 2002 43(1-4, supl 96)
Classificação: 636.08905 |
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