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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. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
17/12/2008 |
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Data da última atualização: |
15/05/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
BEZERRA, M. A.; NOGUEIRA, A. R. de A.; LEMOS, S. G.; FERRERIA, S. L. C. |
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Afiliação: |
Marcos A. Bezerra, UFB; ANA RITA DE ARAUJO NOGUEIRA, CPPSE; Sherlan G. Lemos, UFSCar; Sérgio L. C. Ferreira, UFB. |
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Título: |
Multivariate optimization of a procedure for Cr and Co ultratrace determination in vegetal samples using GF AAS after cloud-point extraction. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
International Journal of Environmental Analytical Chemistry, v. 88, n. 2, p. 131-140, feb. 2008. |
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DOI: |
https://doi.org/10.1080/03067310701581974 |
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Idioma: |
Inglês |
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Conteúdo: |
This work presents the development of a procedure for the determination of Cr and Co from vegetal samples using graphite-furnace atomic absorption spectrometry after cloud-point extraction. The procedure is based on extraction of metals from micellar media of octylphenoxypolythoxy-ethanol (Triton X-114) after complexing the metals with 2-(5-bromo-2-pyridylazo)-5-(diethylamino)-phenol [5-Br-PADAP]. A Doehlert design was used to optimize the pyrolysis and atomization temperatures and pyrolysis time in the determination of analytes trapped in the micellar phase. Ascorbic acid and palladium were used as chemical modifiers, allowing a higher pyrolysis temperature without analyte losses. Enrichment factors of 26.2 and 41.0, along with detection limits (3?B) of 23 and 12 ng L?1 for Cr and Co, respectively, were found. The precision expressed as relative standard deviation was 5.4 and 8.4% for metal concentrations of 0.5 µg L?1 (n = 8) for Cr and Co, respectively. The accuracy was evaluated through the analysis of the certified reference material NIST 1515 (apple leaves). The procedure developed in this study was applied to the determination of Cr and Co concentrations in vegetal leaf samples. |
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Palavras-Chave: |
Cloud point extraction; Dohelert design; GF AAS; Vegetal samples. |
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Thesaurus Nal: |
chromium; cobalt. |
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Categoria do assunto: |
W Química e Física |
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Marc: |
LEADER 02029naa a2200241 a 4500
001 1048695
005 2023-05-15
008 2008 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1080/03067310701581974$2DOI
100 1 $aBEZERRA, M. A.
245 $aMultivariate optimization of a procedure for Cr and Co ultratrace determination in vegetal samples using GF AAS after cloud-point extraction.$h[electronic resource]
260 $c2008
520 $aThis work presents the development of a procedure for the determination of Cr and Co from vegetal samples using graphite-furnace atomic absorption spectrometry after cloud-point extraction. The procedure is based on extraction of metals from micellar media of octylphenoxypolythoxy-ethanol (Triton X-114) after complexing the metals with 2-(5-bromo-2-pyridylazo)-5-(diethylamino)-phenol [5-Br-PADAP]. A Doehlert design was used to optimize the pyrolysis and atomization temperatures and pyrolysis time in the determination of analytes trapped in the micellar phase. Ascorbic acid and palladium were used as chemical modifiers, allowing a higher pyrolysis temperature without analyte losses. Enrichment factors of 26.2 and 41.0, along with detection limits (3?B) of 23 and 12 ng L?1 for Cr and Co, respectively, were found. The precision expressed as relative standard deviation was 5.4 and 8.4% for metal concentrations of 0.5 µg L?1 (n = 8) for Cr and Co, respectively. The accuracy was evaluated through the analysis of the certified reference material NIST 1515 (apple leaves). The procedure developed in this study was applied to the determination of Cr and Co concentrations in vegetal leaf samples.
650 $achromium
650 $acobalt
653 $aCloud point extraction
653 $aDohelert design
653 $aGF AAS
653 $aVegetal samples
700 1 $aNOGUEIRA, A. R. de A.
700 1 $aLEMOS, S. G.
700 1 $aFERRERIA, S. L. C.
773 $tInternational Journal of Environmental Analytical Chemistry$gv. 88, n. 2, p. 131-140, feb. 2008.
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