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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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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
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Registro Completo
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
16/09/2019 |
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Data da última atualização: |
03/10/2019 |
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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: |
FONTANA, C.; SANTINI-JUNIOR, L.; OLMEDO, G. M.; BOTOSSO, P. C.; TOMAZELLO-FILHO, M.; OLIVEIRA, J. M. |
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Afiliação: |
Cláudia Fontana, Universidade do Vale Rio dos Sinos; Luiz Santini-Junior, ESALQ; Gabriela Morais Olmedo, Universidade do Vale Rio dos Sinos; PAULO CESAR BOTOSSO, CNPF; Mario Tomazello-Filho, ESALQ; Juliano Morales Oliveira, Universidade do Vale Rio dos Sinos. |
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Título: |
Assessment of the dendrochronological potential of Licaria bahiana Kurz, an endemic laurel of lowland Atlantic forests in Brazil. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Acta Botanica Brasilica, v. 33, n. 3, p. 454-464. July/Sept. 2019. |
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DOI: |
10.1590/0102-33062019abb0028 |
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Idioma: |
Inglês |
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Conteúdo: |
The Atlantic Forest of southeastern Brazil has been considered to have the highest number of tree species per hectare in the world. Assessing the influence of climate on tropical tree species is a priority in the face of ongoing climate change, and for which dendrochronological studies have been important. We address the dendrochronological potential of Licaria bahiana Kurz (Lauraceae), an endemic species of the Atlantic forests. We studied growth ring anatomy of L. bahiana and applied dendrochronological methods to investigate how short-term variation in climate affect its radial growth. Distinct growth rings were observed in all individuals and demarcated by darker tangential fiber zones in latewood. Trees showed high climatic sensitivity (0.48) and growth synchrony (intercorrelation r = 0.69; rbar = 0.38). Radial growth was negatively influenced by high temperatures at the beginning of the current growing season (r = -0.46) and by excessive rainfall at the end of the current growing season (r = -0.29), which are periods that correspond to the phenological reproductive phases of the species. Climate anomalies during this period may alter the tradeoff between growth and reproduction, in favor of the latter. |
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Palavras-Chave: |
Anéis de crescimento; Dendroecologia; Dendroecology; Floresta de Tabuleiro; Licaria bahiana; Tabuleiro forests; Tree rings. |
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Thesagro: |
Anatomia; Lauraceae; Madeira. |
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Thesaurus NAL: |
Climate; Wood anatomy. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/201946/1/2019-P.Botosso-ABB-Assessment.pdf
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Marc: |
LEADER 02239naa a2200337 a 4500
001 2112180
005 2019-10-03
008 2019 bl uuuu u00u1 u #d
024 7 $a10.1590/0102-33062019abb0028$2DOI
100 1 $aFONTANA, C.
245 $aAssessment of the dendrochronological potential of Licaria bahiana Kurz, an endemic laurel of lowland Atlantic forests in Brazil.$h[electronic resource]
260 $c2019
520 $aThe Atlantic Forest of southeastern Brazil has been considered to have the highest number of tree species per hectare in the world. Assessing the influence of climate on tropical tree species is a priority in the face of ongoing climate change, and for which dendrochronological studies have been important. We address the dendrochronological potential of Licaria bahiana Kurz (Lauraceae), an endemic species of the Atlantic forests. We studied growth ring anatomy of L. bahiana and applied dendrochronological methods to investigate how short-term variation in climate affect its radial growth. Distinct growth rings were observed in all individuals and demarcated by darker tangential fiber zones in latewood. Trees showed high climatic sensitivity (0.48) and growth synchrony (intercorrelation r = 0.69; rbar = 0.38). Radial growth was negatively influenced by high temperatures at the beginning of the current growing season (r = -0.46) and by excessive rainfall at the end of the current growing season (r = -0.29), which are periods that correspond to the phenological reproductive phases of the species. Climate anomalies during this period may alter the tradeoff between growth and reproduction, in favor of the latter.
650 $aClimate
650 $aWood anatomy
650 $aAnatomia
650 $aLauraceae
650 $aMadeira
653 $aAnéis de crescimento
653 $aDendroecologia
653 $aDendroecology
653 $aFloresta de Tabuleiro
653 $aLicaria bahiana
653 $aTabuleiro forests
653 $aTree rings
700 1 $aSANTINI-JUNIOR, L.
700 1 $aOLMEDO, G. M.
700 1 $aBOTOSSO, P. C.
700 1 $aTOMAZELLO-FILHO, M.
700 1 $aOLIVEIRA, J. M.
773 $tActa Botanica Brasilica$gv. 33, n. 3, p. 454-464. July/Sept. 2019.
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Registro original: |
Embrapa Florestas (CNPF) |
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