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| Registros recuperados : 171 | |
| 4. |  | SANTOS, D. M.; NOGUEIRA, A. R. de A.; NEVES, E. F. A.; NÓBREGA, J. A. Análise química e simulação do reagente CFA-C. In: ENCONTRO REGIONAL DE QUÍMICA DA SOCIEDADE BRASILEIRA DE QUÍMICA, 13.; SEMANA DA QUÍMICA, 31., 2001, Jaboticabal, SP. Anais... Jaboticabal: Instituto de Química-UNESP, 2001. p.70. QA-8.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 5. | | TREVISAN, L. C.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. Acid vapor partial digestion of biological samples in a focused microwave: multielement determination by ICP OES with axially-viewed configuration. In: RIO SYMPOSIUM ON ATOMIC SPECTROMETRY, 7., 2002, Florianópolis, SC. ICP Information Newsletter, v.28, n.1, june 2002. p.136. Tu34.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 14. | | SILVA, H. O.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. Extração assistida por ultra-som de Al, Ca, Mg e Mn em amostras de chás. In: REUNIÃO ANUAL DA SOCIEDADE DE BRASILEIRA DE QUÍMICA, 26., 2003, Poços de Caldas, MG. Livros de resumos... Poços de Caldas: SBQ, 2003.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 18. | | SILVA, F. V.; SILVA, C. S.; NÓBREGA, J. A.; NOGUEIRA, A. R. de A. Evaluation of inductively coupled plasma optical emission spectrometers with axially-and radially-viewed configurations. In: RIO SYMPOSIUM ON ATOMIC SPECTROMETRY, 7., 2002, Florianópolis, SC. ICP Information Newsletter, v.28, n.1, jun. 2002. 2 p.| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| Registros recuperados : 171 | |
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Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
22/08/2005 |
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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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Autoria: |
SANTOS, M. C.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. |
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Afiliação: |
MIRIAN C. SANTOS, Universidade Federal de São Carlos; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; JOAQUIM A. NÓBREGA, Universidade Federal de São Carlos. |
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Título: |
Clay and refractory materials slurries in ductively coupled plasma optical emission spectrometry: effects of mechano chemical on emission intensities of analytes. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Journal of Brazilian Chemical Society, v. 16, n. 3a, p. 372-380, june 2005. |
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DOI: |
https://doi.org/10.1590/S0103-50532005000300010 |
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Idioma: |
Inglês |
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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 |
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Palavras-Chave: |
ICP; Mechanochemical synthesis; OES; Refractory material; Slurry. |
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Thesaurus NAL: |
clay. |
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Categoria do assunto: |
W Química e Física |
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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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