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| Registros recuperados : 4 | |
| Registros recuperados : 4 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Pecuária Sudeste. Para informações adicionais entre em contato com cppse.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
23/01/2006 |
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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: |
LIN, P. K. T; NOGUEIRA, A. R. de A.; MONTENEGRO, M. C. B. S.; PÉREZ-OLMOS, R. |
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Afiliação: |
P. KONG THOO LIN, The Robert Gordon University; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; M. C. B. S. M. MONTENEGRO, Universidade do Porto; R. PÉREZ-OLMOS, Universidad del País Vasco. |
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Título: |
New PVC nitrate-selective electrode: application to vegetles and mineral waters. |
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Ano de publicação: |
2005 |
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Fonte/Imprenta: |
Journal of Agricultural and Food Chemistry, v. 53, n. 2, p. 211-215, 2005. |
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DOI: |
10.1021/jf049227u |
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Idioma: |
Inglês |
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Conteúdo: |
The paper refers the analytical potentialities of the oxa-azamacrocycles as potentiometric ionophores for the construction of electrodes selective to nitrate. Afterward, the membrane selective to nitrate is designed and optimized using a [3.3.3.3]oxazane as an ionophore. The membrane was prepared using dibutylphthalate as a solvent mediator, tetraoctylammonium as a lipophilic membrane additive, and poly(vinyl chloride (PVC) as a polymeric matrix, applied directly onto a conductive graphite/epoxy resin support. The electrodes presented a slope of 60 ± 0.1 mV log-1, a low limit of linear response of 4.2 × 10-6 mol L-1, a useful lifetime of 1 year, and improved selectivity characteristics when compared with other nitrate electrodes. The good working characteristics of this electrode, constructed without inner-reference solution, made possible its application to the determination of nitrate in different types of vegetables and bottled mineral waters without the use of a conditioning solution. The application of a significant F test proved that the results obtained were similar to those attained by application of the brucine spectrophotometric method adopted as a reference technique. Linear regression analysis also showed good agreement between the results obtained by the proposed method and the reference one. |
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Palavras-Chave: |
New PVC; Nitrate selective electrode. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 01946naa a2200193 a 4500
001 1047287
005 2023-03-13
008 2005 bl uuuu u00u1 u #d
024 7 $a10.1021/jf049227u$2DOI
100 1 $aLIN, P. K. T
245 $aNew PVC nitrate-selective electrode$bapplication to vegetles and mineral waters.$h[electronic resource]
260 $c2005
520 $aThe paper refers the analytical potentialities of the oxa-azamacrocycles as potentiometric ionophores for the construction of electrodes selective to nitrate. Afterward, the membrane selective to nitrate is designed and optimized using a [3.3.3.3]oxazane as an ionophore. The membrane was prepared using dibutylphthalate as a solvent mediator, tetraoctylammonium as a lipophilic membrane additive, and poly(vinyl chloride (PVC) as a polymeric matrix, applied directly onto a conductive graphite/epoxy resin support. The electrodes presented a slope of 60 ± 0.1 mV log-1, a low limit of linear response of 4.2 × 10-6 mol L-1, a useful lifetime of 1 year, and improved selectivity characteristics when compared with other nitrate electrodes. The good working characteristics of this electrode, constructed without inner-reference solution, made possible its application to the determination of nitrate in different types of vegetables and bottled mineral waters without the use of a conditioning solution. The application of a significant F test proved that the results obtained were similar to those attained by application of the brucine spectrophotometric method adopted as a reference technique. Linear regression analysis also showed good agreement between the results obtained by the proposed method and the reference one.
653 $aNew PVC
653 $aNitrate selective electrode
700 1 $aNOGUEIRA, A. R. de A.
700 1 $aMONTENEGRO, M. C. B. S.
700 1 $aPÉREZ-OLMOS, R.
773 $tJournal of Agricultural and Food Chemistry$gv. 53, n. 2, p. 211-215, 2005.
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