Sistema TS-FF-AAS com chama acetileno-ar como alternativa em relação à chama acetileno-óxido nitroso em FAAS na determinação de estanho

Lobo, Fabiana Aparecida; Villafranca, Ana Cristina; Oliveira, Adriana Paiva de; Moraes, Mercedes de

doi:10.1590/s0100-46702005000200008

Cited by 7 publications

(3 citation statements)

References 8 publications

(15 reference statements)

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“…To propose the optimum metal characteristics used for atomizer compositions and to identify new compositions, an approach was adopted by selecting 34 elements and its respective 22 selected physicochemical parameters. [17][18][19] The elements were selected following the criteria: (a) those normally found in tubes used in AAS [20][21][22] (Mo, Ni, and W), (b) those commonly used as chemical modifiers (CM-conventional or permanent) in AAS [23][24][25][26][27][28] (Ir, Mg, Mo, Pd, Rh, Ti, V, W and Zr), (c) those already determined by TS-FF-AAS [1][2][3][4][5][6][7]29,30 (Ag, As, Au, Bi, Cd, Co, Cu, Hg, K, Mn, Pb, Pd, Rb, Sb, Se, Sn, Te, Tl and Zn) and (d) those with analytical interest (Al, Ca, Cr, Fe, Li and Na). Some elements (Mo, W and Pd) were classified in two groups.…”

Section: B Atomizersmentioning

confidence: 99%

Tube atomizers in thermospray flame furnace atomic absorption spectrometry: characterization using X-ray fluorescence, scanning electron microscopy and chemometrics

Petrucelli

Stocco

Bueno

et al. 2006

J. Anal. At. Spectrom.

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This work describes some complementary strategies for characterization and performance evaluation of tube atomizers used in thermospray flame furnace atomic absorption spectrometry. Metal tubes composed of Cr, Fe, Mo, Ni, Ti and W and ceramic tubes were characterized before and after being used for determinations of Cd, Cu, Mn, Pb and Zn in aqueous solutions, food and environmental samples. The best performances were observed for Ni-99% and Ti-99% atomizers. Ti and Ni atomizer lifetimes were around 5 and at least 88 hours, respectively. Titanium oxide (TiO 2) formation on the external surfaces of Ti tubes is a clear indication of its short lifetime. This observation was confirmed by X-ray fluorescence analyses and histograms of images obtained by scanning electron microscopy. Nickel tube atomizers presented small morphological distinctions when comparing new and used tubes, without affecting their analytical performances.

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Section: B Atomizersmentioning

confidence: 99%

Tube atomizers in thermospray flame furnace atomic absorption spectrometry: characterization using X-ray fluorescence, scanning electron microscopy and chemometrics

Petrucelli

Stocco

Bueno

et al. 2006

J. Anal. At. Spectrom.

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“…En los últimos años se han reportado mejoras significativas en los límites de detección de la espectrofotometría de la absorción atómica (AAS) mediante atomización con tubo en la llama en sus variantes denominadas thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) 1-4 y beam-injection flame furnace atomic absorption spectrometry (BIFF-AAS). [5][6][7] Dentro de estas mejoras, Wu et al 4 ha propuesto una nueva forma de introducción de muestra en TS-FF-AAS y Lobo et al, 8 ha presentado importantes resultados del uso de la mezcla de gases de óxido nitroso-acetileno para la determinación de estaño. Por otro lado, variadas aplicaciones de la TS-FF-AAS han sido investigadas, tales como: las determinaciones de los metales trazas Cd, Pb y Zn tanto en muestras biológicas 9,10 y alimentos, [11][12][13] como también en algunas matrices marinas 14,15 y Cd y Pb en muestras de tabaco brasilero.…”

Section: Introduccionunclassified

Preconcentración y atomización con tubo en la llama para la determinación de Cadmio en agua de mar

Sepúlveda¹,

Fuentes²,

Hinojosa³

2011

Quím. Nova

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IN SEAWATER. A flow injection on-line pre-concentration system coupled to thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) for cadmium determination at sub µg L-1 levels in seawater samples was developed. The on-line system was evaluated by analysing cadmium containing in a synthetic seawater matrix (2.5% m/v NaCl, 0.5% m/v MgCl 2 and 0.8% m/v CaCl 2). A sample volume of 2 mL allows determining Cd with a detection limits of 30 ng L-1 (3* σ blank /slope), pre-concentration factor of 34 and repeatability of 1,8% (calculated as RSD, N=8 and containing 200 ng L-1 of Cd).

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“…Therefore, the efficiency of the sample transport and the increase of the analytes residence time in the absorption volume results in a significant detectability improvement of Ag, As, Au, Bi, Cd, Co, Cu, Hg, In, K, Mn, Pb, Pd, Rb, Sb, Se, Sn, Te, Tl and Zn. [2][3][4][5] The TS-FF-AAS applications in analytical chemistry are growing and approximately 20 publications can be currently found in the literature. Biological samples can be analyzed with no previous mineralization procedure using direct slurry introduction into the atomizer.…”

Section: Introductionmentioning

confidence: 99%

Relevant information of concomitants obtained from background signal using thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) and chemometric tools

Miranda¹,

Bueno

Pereira-Filho³

2009

J. Anal. At. Spectrom.

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This study reports the use of background signals and multivariate calibration as a procedure to assess total concentration of concomitants in thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS). TS-FF-AAS employs a metal tube atomizer above an air/acetylene flame and the atoms residence time is longer than that observed in FAAS (flame AAS). As a result, elevated background signals are obtained. The main purpose of this study is to make use of the background signals to predict the total concentration of concomitants. Background signals of 29 solutions containing Cd (25 mg L À1 ), Pb (500 mg L À1 ) and four concomitants (Ca, K, Mg and Na-total concentration values ranging from 0 to 5.52 g L À1 ) were recorded at two wavelengths: 228.8 nm for Cd and 283.3 nm for Pb. With the help of partial least squares, calibration models using either each wavelength alone or a combination of both were constructed to predict the total concentrations of concomitants. The best model showed root mean square error of validation (RMSEV) of 0.35 g L À1 using background signals at 283.3 nm. A pharmaceutical sample containing 3 g L À1 of the total concentration of Ca, K, Mg and Na was analyzed and 3% was the relative error. This sample and those used in the calibration/validation sets were also analyzed using X-ray fluorescence (XRF) and a good agreement was observed. This study extends the possibilities for the use of background signals in spectrometric techniques.

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Sistema TS-FF-AAS com chama acetileno-ar como alternativa em relação à chama acetileno-óxido nitroso em FAAS na determinação de estanho

Cited by 7 publications

References 8 publications

Tube atomizers in thermospray flame furnace atomic absorption spectrometry: characterization using X-ray fluorescence, scanning electron microscopy and chemometrics

Tube atomizers in thermospray flame furnace atomic absorption spectrometry: characterization using X-ray fluorescence, scanning electron microscopy and chemometrics

Preconcentración y atomización con tubo en la llama para la determinación de Cadmio en agua de mar

Relevant information of concomitants obtained from background signal using thermospray flame furnace atomic absorption spectrometry (TS-FF-AAS) and chemometric tools

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