Simulation of atomic absorption signals: A kinetic model with two independent sources

Buhay, O. M.; Rogulsky, Yu. V.; Kulik, A. N.; Калинкевич, А. Н.; Sukhodub, L. F.

doi:10.1016/j.sab.2005.03.016

Cited by 12 publications

(10 citation statements)

References 33 publications

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“…Also, it has been reported [31,32] that two peaks in the signal can be explained by the presence of two sources of the free atoms, one from the furnace surface; the other, inside the furnace wall, which is affected substantially by destruction of the pyrolytic coating that is brought on by oxidation of graphite that is catalyzed by the formed tungsten carbides [29]. Additional research is needed in order to explain fully the mechanism of this phenomenon.…”

Section: Resultsmentioning

confidence: 99%

Effect on silicon atomization of tungsten-assisted modification of atomic-absorption spectrometer graphite furnaces

2008

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The influence of a tungsten-assisted modification to a tubular graphite furnace in an atomic absorption spectrometer on the Si atomization signal characteristics is studied. A hypothesis is proposed that explains a shift of Si atomization peaks for the modified furnaces compared with the standard ones. Some advantages of the standard tubular graphite furnaces modified by tungsten and the prospects for their application are demonstrated.

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Section: Resultsmentioning

confidence: 99%

Effect on silicon atomization of tungsten-assisted modification of atomic-absorption spectrometer graphite furnaces

2008

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“…Also, by measuring the partial pressure of oxygen (16,17) and through adsorption-desorption of the analyte from the atomizer surface (18,19), the atomization mechanism of the particular analyte can be studied. In the present studies, we adopted the combined kineticthermodynamic approach to understand the atomization mechanism.…”

Section: Introductionmentioning

confidence: 99%

Influence of Uranium, Thorium, and Zirconium Matrices on Silver Absorbance in Graphite Furnace Atomic Spectrometry (GFAAS)

Purohit¹

2012

At.Spectrosc.

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“…In order to avoid errors associated with the influence of the chemical matrix and to identify the reasons for distortion of the analytical signal, a phenomenological model for physicochemical atomization processes can be utilized [3] which we have successfully used for monitoring the reliability of impurity determination in reactor zirconium [4]: …”

Section: Introductionmentioning

confidence: 99%

“…Before the measurements, the furnace was annealed until residues of compounds of the analyte element were completely removed. The signals from the calibration solutions and the lichen samples were approximated by a kinetic model with two independent sources [3]. The calculated parameters of the samples and the calibration solutions were compared.…”

Section: Introductionmentioning

confidence: 99%

Model for verification of measurement results in electrothermal atomic absorption spectrometry

2011

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We present a practical application of a phenomenological model for physicochemical atomization processes in determining heavy metal content by electrothermal atomic absorption spectrometry. Comparison of the analysis results with the NAHRES-33 (IAEA/AL/079) certificate of composition confirms the feasibility of using the proposed procedure in analysis of lichen materials. As the criterion for the reliability of the analysis results, we take the closeness of the values for the sample atomization parameters to the atomization parameters of the calibration solutions obtained, using a model for the analytical signal. We demonstrate application of the proposed procedure using as an example monitoring of heavy-metal air pollution by the lichen indication method.Keywords: atomic absorption spectrometry, electrothermal atomization, modeling of an analytical signal, energy of formation of the free atoms, lichen indication.Introduction. As we know, the atomic absorption spectrometry method is a relative method and requires preliminary calibration of the instrument using solutions with known content of the analyte element. For correct analysis, the matrix of this calibration solution must be as close as possible to the sample matrix with respect to chemical composition. In cases when the composition of the matrix is complicated or unknown, generally standard samples (reference standards) are used.If the necessary standards are not available, for calibration of the instrument the method of standard additions is used, which has certain limitations since the additions cannot always be introduced in the same chemical form as the analyte in the sample [1,2]. In this case, analyte losses when a volatile compound is formed with the matrix or if it is incompletely atomized when a refractory compound is formed with the matrix can lead to substantial analysis error.In order to avoid errors associated with the influence of the chemical matrix and to identify the reasons for distortion of the analytical signal, a phenomenological model for physicochemical atomization processes can be utilized [3] which we have successfully used for monitoring the reliability of impurity determination in reactor zirconium [4]:

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Simulation of atomic absorption signals: A kinetic model with two independent sources

Cited by 12 publications

References 33 publications

Effect on silicon atomization of tungsten-assisted modification of atomic-absorption spectrometer graphite furnaces

Effect on silicon atomization of tungsten-assisted modification of atomic-absorption spectrometer graphite furnaces

Influence of Uranium, Thorium, and Zirconium Matrices on Silver Absorbance in Graphite Furnace Atomic Spectrometry (GFAAS)

Model for verification of measurement results in electrothermal atomic absorption spectrometry

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