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Registro Completo |
Biblioteca(s): |
Embrapa Pecuária Sudeste. |
Data corrente: |
22/08/2005 |
Data da última atualização: |
13/03/2023 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
SANTOS, M. C.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. |
Afiliação: |
MIRIAN C. SANTOS, Universidade Federal de São Carlos; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; JOAQUIM A. NÓBREGA, Universidade Federal de São Carlos. |
Título: |
Clay and refractory materials slurries in ductively coupled plasma optical emission spectrometry: effects of mechano chemical on emission intensities of analytes. |
Ano de publicação: |
2005 |
Fonte/Imprenta: |
Journal of Brazilian Chemical Society, v. 16, n. 3a, p. 372-380, june 2005. |
DOI: |
https://doi.org/10.1590/S0103-50532005000300010 |
Idioma: |
Inglês |
Conteúdo: |
The developed work investigated the application of mechanochemical synthesis for promoting reactions in the samples and for synthesizing new compounds for increment of emission intensities of analytes in clays and refractory materials slurries in inductively coupled plasma optical emission spectrometry with axial viewing. The hypothesis is that it is possible to generate more volatile compounds during the grinding step and these new compounds will increase the intensities of emission signals for slurries introduced in the plasma. The action of two chemical modifiers, LiBO2 and Na2CO3, added during the grinding step was evaluated. The clays and refractory materials mixed with the chemical modifier were ground for 2 h using a high impact ball mill with a tungsten carbide grinding container and balls. Slurries were prepared by dispersing the modified clays and refractory materials in 10% v v-1 HNO3 solution and by shaking them in an ultrasonic bath to ensure good dispersion. The compounds produced during the grinding step were characterised by X-ray diffraction and thermogravimetric analysis. Both techniques indicated the formation of new compounds in clays and refractory materials by mechanochemical synthesis. Chemical modification effects were evaluated by changes of the emission intensities of Al, Ca, Fe, K, Mg, P, Si, and Ti. Both modifiers caused increments of sensitivities for all analytes in up to 665% (Na2CO3) and 583% (LiBO2) compared to the emission signals for analytes present in slurries prepared using samples ground without adding modifiers. MenosThe developed work investigated the application of mechanochemical synthesis for promoting reactions in the samples and for synthesizing new compounds for increment of emission intensities of analytes in clays and refractory materials slurries in inductively coupled plasma optical emission spectrometry with axial viewing. The hypothesis is that it is possible to generate more volatile compounds during the grinding step and these new compounds will increase the intensities of emission signals for slurries introduced in the plasma. The action of two chemical modifiers, LiBO2 and Na2CO3, added during the grinding step was evaluated. The clays and refractory materials mixed with the chemical modifier were ground for 2 h using a high impact ball mill with a tungsten carbide grinding container and balls. Slurries were prepared by dispersing the modified clays and refractory materials in 10% v v-1 HNO3 solution and by shaking them in an ultrasonic bath to ensure good dispersion. The compounds produced during the grinding step were characterised by X-ray diffraction and thermogravimetric analysis. Both techniques indicated the formation of new compounds in clays and refractory materials by mechanochemical synthesis. Chemical modification effects were evaluated by changes of the emission intensities of Al, Ca, Fe, K, Mg, P, Si, and Ti. Both modifiers caused increments of sensitivities for all analytes in up to 665% (Na2CO3) and 583% (LiBO2) compared to the emission signals for analyt... Mostrar Tudo |
Palavras-Chave: |
ICP; Mechanochemical synthesis; OES; Refractory material; Slurry. |
Thesaurus Nal: |
clay. |
Categoria do assunto: |
W Química e Física |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/110387/1/a10v16n3a.pdf
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Marc: |
LEADER 02362naa a2200229 a 4500 001 1047197 005 2023-03-13 008 2005 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1590/S0103-50532005000300010$2DOI 100 1 $aSANTOS, M. C. 245 $aClay and refractory materials slurries in ductively coupled plasma optical emission spectrometry$beffects of mechano chemical on emission intensities of analytes.$h[electronic resource] 260 $c2005 520 $aThe developed work investigated the application of mechanochemical synthesis for promoting reactions in the samples and for synthesizing new compounds for increment of emission intensities of analytes in clays and refractory materials slurries in inductively coupled plasma optical emission spectrometry with axial viewing. The hypothesis is that it is possible to generate more volatile compounds during the grinding step and these new compounds will increase the intensities of emission signals for slurries introduced in the plasma. The action of two chemical modifiers, LiBO2 and Na2CO3, added during the grinding step was evaluated. The clays and refractory materials mixed with the chemical modifier were ground for 2 h using a high impact ball mill with a tungsten carbide grinding container and balls. Slurries were prepared by dispersing the modified clays and refractory materials in 10% v v-1 HNO3 solution and by shaking them in an ultrasonic bath to ensure good dispersion. The compounds produced during the grinding step were characterised by X-ray diffraction and thermogravimetric analysis. Both techniques indicated the formation of new compounds in clays and refractory materials by mechanochemical synthesis. Chemical modification effects were evaluated by changes of the emission intensities of Al, Ca, Fe, K, Mg, P, Si, and Ti. Both modifiers caused increments of sensitivities for all analytes in up to 665% (Na2CO3) and 583% (LiBO2) compared to the emission signals for analytes present in slurries prepared using samples ground without adding modifiers. 650 $aclay 653 $aICP 653 $aMechanochemical synthesis 653 $aOES 653 $aRefractory material 653 $aSlurry 700 1 $aNOGUEIRA, A. R. de A. 700 1 $aNÓBREGA, J. A. 773 $tJournal of Brazilian Chemical Society$gv. 16, n. 3a, p. 372-380, june 2005.
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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Registro Completo
Biblioteca(s): |
Embrapa Agroindústria Tropical. |
Data corrente: |
05/06/2020 |
Data da última atualização: |
29/06/2020 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 2 |
Autoria: |
FERNANDES, F. A. N.; FONTELES, T. V.; RODRIGUES, S.; BRITO, E. S. de; TIWARI, B. K. |
Afiliação: |
FABIANO A. N. FERNANDES, Departamento de Engenharia Qu? ?mica, Universidade Federaldo Ceara; THATYANE V. FONTELES, Departamento de Engenharia de Alimentos, UniversidadeFederal do Ceara; SUELI RODRIGUES, Departamento de Engenharia de Alimentos, UniversidadeFederal do Ceara; EDY SOUSA DE BRITO, CNPAT; BRIJESH K. TIWARI, Department of Food Biosciences, Teagasc Food ResearchCentre, Dublin, Ireland. |
Título: |
Ultrasound-assisted extraction of anthocyanins and phenolics from jabuticaba (Myrciaria cauliflora) peel: kinetics and mathematical modeling. |
Ano de publicação: |
2020 |
Fonte/Imprenta: |
Journal of Food Science and Technology, 57 (6), pp. 2321-2328, 2020. |
DOI: |
https://doi.org/10.1007/s13197-020-04270-3 |
Idioma: |
Inglês |
Palavras-Chave: |
Extração da modelagem de ácido elágico. |
Thesagro: |
Jabuticaba. |
Thesaurus NAL: |
Ellagic acid; Extraction. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00775naa a2200217 a 4500 001 2123110 005 2020-06-29 008 2020 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1007/s13197-020-04270-3$2DOI 100 1 $aFERNANDES, F. A. N. 245 $aUltrasound-assisted extraction of anthocyanins and phenolics from jabuticaba (Myrciaria cauliflora) peel$bkinetics and mathematical modeling.$h[electronic resource] 260 $c2020 650 $aEllagic acid 650 $aExtraction 650 $aJabuticaba 653 $aExtração da modelagem de ácido elágico 700 1 $aFONTELES, T. V. 700 1 $aRODRIGUES, S. 700 1 $aBRITO, E. S. de 700 1 $aTIWARI, B. K. 773 $tJournal of Food Science and Technology, 57 (6), pp. 2321-2328, 2020.
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