2005
DOI: 10.1590/s0103-50532005000500008
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Abstract: Um sistema contendo Amberlite XAD -2 (estireno-divinilbenzeno) carregado com 2-(2-tiazolilazo)-5-dimetilaminfenol (TAM) é proposto para amostragem em campo, preconcentração e determinação de cádmio (II) e níquel (II) em amostras de águas naturais usando espectrometria de absorção atômica com chama (FAAS). O processo de otimização foi univariado e os seguintes parâmetros foram estudados: efeito de pH, efeito de vazão de amostragem, concentração da solução e vazão de eluente, efeito de outros ions, precisão e ex… Show more

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Cited by 14 publications
(4 citation statements)
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References 17 publications
(18 reference statements)
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“…The peaks at 1417 cm -1 and 1423 cm -1 , in T+B+P and T+B+P+PEG+S layers, respectively, can be ascribed to the adsorption peak of a polyphenol C=O vibration. 46 The most remarkable difference in FTIR spectra of rust and inhibitor-modified rust layers is the loss of intensity and shift of magnetite peak at 574 cm -1 of the rust layer to 506 cm -1 in the case of the inhibitor-modified rust layer, probably due to the conversion process to ferric tannate. 45 FTIR spectra show a dominant role of flavonoid species, present both in tannin and propolis, on the formation of the inhibitor-modified rust layer.…”
Section: R1mentioning
confidence: 99%
“…The peaks at 1417 cm -1 and 1423 cm -1 , in T+B+P and T+B+P+PEG+S layers, respectively, can be ascribed to the adsorption peak of a polyphenol C=O vibration. 46 The most remarkable difference in FTIR spectra of rust and inhibitor-modified rust layers is the loss of intensity and shift of magnetite peak at 574 cm -1 of the rust layer to 506 cm -1 in the case of the inhibitor-modified rust layer, probably due to the conversion process to ferric tannate. 45 FTIR spectra show a dominant role of flavonoid species, present both in tannin and propolis, on the formation of the inhibitor-modified rust layer.…”
Section: R1mentioning
confidence: 99%
“…Para el caso de los metales cadmio y plomo, que se encuentran en concentraciones más baja, la alta interferencia de las sales de NaCl no permite la determinación directa de estos metales en dichas aguas costeras. Una alternativa para suplir este problema analítico ha sido el desarrollo y aplicación de metodologías analíticas más sensibles y confiables, por ejemplo la pre-concentración/ separación de la matriz, 17,18 co-precipitación, 19 extracción, 20,21 etc., todo ello con el fin de separar la matriz interferente y mejorar significativamente los límites de detección en técnicas como absorción atómica con llama, [22][23][24] horno de grafito, [25][26][27] plasma óptico acoplado inductivamente [24][25][26] y plasma masa acoplado inductivamente. 28 Burguera et al 29 han presentado los avances en sistemas de inyección en flujo que incorpora la preconcentración y el empleo de variadas técnicas para la determinación de metales pesados a niveles de ng L -1 en materiales biológicos, aguas dulces y aguas de mar.…”
Section: Introduccionunclassified
“…Later considerable works were published by Péter [14,15]. At present it is obvious the surface sizes, structures, activities and the internal chemical and crystal composition of materials can be modified by a controlled mechanical activation process [16][17][18][19][20][21][22][23] …”
Section: Introductionmentioning
confidence: 99%