Relevant bibliographies by topics / Graphite tube atomizer

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  2. Dissertations / Theses

Academic literature on the topic 'Graphite tube atomizer'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Graphite tube atomizer"

1

Komárek, Josef, and Mojmír Gánóczy. "Determination of europium by AAS with electrothermal atomization." Collection of Czechoslovak Chemical Communications 56, no. 4 (1991): 764–73. http://dx.doi.org/10.1135/cccc19910764.

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A WETA all-tungsten atomizer and a tungsten probe in conjunction with a graphite atomizer were used for the electrothermal atomization of europium. The life of the tungsten probe was extended by combining it with a pyrolytically coated graphite tube fitted with tantalum lining and using argon-hydrogen atmosphere. The sensitivity of europium determination in the tungsten atomizer was increased by adding La3+ in a concentration of 0.02 g l-1.
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Huie, Carmen W., and Charles J. Curran. "Spatial Mapping of Analyte Distribution within a Graphite Furnace Atomizer." Applied Spectroscopy 42, no. 7 (September 1988): 1307–11. http://dx.doi.org/10.1366/0003702884430001.

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A versatile diagnostic scheme based on the combination of the unique properties of a laser, such as collimation and monochromaticity, together with absorption spectroscopy and subsequent computer extraction of quantitative information from a video signal has been applied to acquire spatially and temporally resolved information in a graphite tube atomizer. Spatially resolved concentration profiles with a 256 × 240 array of intensities can be obtained in 1/60 second. This capability has been demonstrated in the study of sodium atom distribution within a graphite furnace. Spatially and temporally resolved absorbance profiles taken within the furnace show extreme nonuniformities throughout the lifetime of the sodium atom plume. Early in the absorbance signal, the distributions show absorbances which decrease in going from the bottom, where the sample was initially deposited, to the top of the furnace. A more uniform distribution of the free atoms can be seen after a majority of the analyte has been released from the surface of the graphite tube, i.e., after the absorbance peak.
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Katskov, Dmitri, Rita Mofolo, and Paolo Tittarelli. "Energy transfer caused by reactions in a graphite tube atomizer." Spectrochimica Acta Part B: Atomic Spectroscopy 56, no. 9 (September 2001): 1625–44. http://dx.doi.org/10.1016/s0584-8547(01)00249-x.

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4

Rybínová, Marcela, Václav Červený, and Petr Rychlovský. "UV-photochemical vapour generation with in situ trapping in a graphite tube atomizer for ultratrace determination of selenium." Journal of Analytical Atomic Spectrometry 30, no. 8 (2015): 1752–63. http://dx.doi.org/10.1039/c5ja00173k.

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UV-photochemical vapour generation followed by in situ trapping and atomization of the generated volatile compounds in the graphite furnace atomizer of an atomic absorption spectrometer (GF-AAS) was employed to determine selenium in the sub-ppb range.
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5

Masera, Eric, Patrick Mauchien, and Yannick Lerat. "Imaging of analyte distribution in a graphite tube atomizer by laser induced fluorescence." Spectrochimica Acta Part B: Atomic Spectroscopy 51, no. 9-10 (July 1996): 1007–22. http://dx.doi.org/10.1016/0584-8547(96)01513-3.

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Hertzberg, J., D. Kozlov, C. Rieck, P. Loosen, M. Sperling, B. Welz, and G. Marowsky. "CARS thermometry in a transversely heated graphite-tube atomizer used in atomic absorption spectrometry." Applied Physics B Laser and Optics 61, no. 2 (August 1995): 201–5. http://dx.doi.org/10.1007/bf01090944.

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7

Mofolo, Rita M., Dmitri A. Katskov, Paolo Tittarelli, and Marco Grotti. "Vaporization of indium nitrate in the graphite tube atomizer in the presence of chemical modifiers." Spectrochimica Acta Part B: Atomic Spectroscopy 56, no. 4 (April 2001): 375–91. http://dx.doi.org/10.1016/s0584-8547(01)00167-7.

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8

Skelly, E. M., and F. T. Distefano. "Clean Room and Microwave Digestion Techniques: Improvement in Detection Limits for Aluminum Determination by GF-AAS." Applied Spectroscopy 42, no. 7 (September 1988): 1302–6. http://dx.doi.org/10.1366/0003702884430119.

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A rapid, precise, and accurate method for the determination of aluminum in part-per-billion concentrations in biological materials using graphite-furnace atomic absorption spectroscopy has been developed. In order that the necessary accuracy and precision for the analysis of aluminum in bone and brain tissue could be obtained, reduction of laboratory environmental contributions to the aluminum blank was required. Use of a closed-vessel microwave digestion system and a clean room for sample preparation accomplished this goal by reducing Al concentrations in the digestion blanks from 10 ppb to 1 ppb. Digestion time was decreased from many hours to several minutes, and the amount of acid required for digestion was reduced by 70%. Using less nitric acid improved precision in the analyzed solutions by significantly extending the lifetime and consistency in performance of the graphite tube atomizer.
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Zakharov, Yu A., O. B. Kokorina, and R. V. Okunev. "The influence of a probe on the optical path of atomic absorption spectrometer with a graphite tube atomizer." Optics and Spectroscopy 116, no. 4 (April 2014): 642–48. http://dx.doi.org/10.1134/s0030400x14040274.

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10

Altman, E. L., and N. A. Panichev. "Determination of cadmium in tobacco smoke by electrothermal atomic absorption spectroscopy with electrostatic precipitation of samples on the graphite tube atomizer." Journal de Physique IV (Proceedings) 107 (May 2003): 37–40. http://dx.doi.org/10.1051/jp4:20030237.

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Dissertations / Theses on the topic "Graphite tube atomizer"

1

Furdíková, Zuzana. "Studium generování, záchytu a atomizace těkavých hydridů pro metody atomové spektrometrie." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-233290.

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Interference effects of co-generated hydrides of arsenic, antimony, bismuth and selenium on trapping behavior of selenium or antimony hydrides (analytes) within iridium modified, transversely heated graphite tube atomizer (THGA) was investigated. A twin-channel hydride generation system was used for independent separate generation and introduction of analyte and interferent hydrides, i.e. in simultaneous and/or sequential analyte-interferent and interferent-analyte mode of operation. Influence of the analyte and modifier mass, interferent amount, trapping temperature and composition of the gaseous phase was studied. A simple approach for elimination of mutual interference effects by modification of the gaseous phase with oxygen in substoichiometric ratio to chemically generated hydrogen is proposed and suppression of these interference effects is demonstrated. A hypothesis on mechanism of trapping and mutual interference effects is drawn.
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2

Katskov, DA, and N. Darangwa. "Application of Langmuir theory of evaporation to the simulation of sample vapor composition and release rate in graphite tube atomizers. Part 1. The model and calculation algorithm." Journal of Analytical Atomic Spectrometry, 2010. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001252.

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A method is suggested for simulation of transient sample vapor composition and release rate during vaporization of analytes in electrothermal (ET) atomizers for AAS. The approach is based on the Langmuir theory of evaporation of metals in the presence of a gas at atmospheric pressure, which advocates formation of mass equilibrium in the boundary layer next to the evaporation surface. It is suggested in this work that in ET atomizers the release of atoms and molecules from the boundary layer next to the dry residue of the analyte is accompanied by spreading of the layer around the sample droplets or crystals. Thus, eventually, the vapor source forms an effective area associated with a monolayer of the analyte. In particular, for the case of a metal oxide analyte as discussed in the work, the boundary layer contains the species present in thermodynamic equilibrium with oxide, which are metal atoms and dimers, oxide molecules and oxygen. Because of an excess of Ar, the probability of mass and energy exchange between the evolved gaseous species is low, this substantiates independent mass transport of each type of species from the boundary layer and through absorption volume. Diffusion, capture by Ar flow and gas thermal expansion is considered to control vapor transport and release rate. Each specific flow is affected by secondary processes occurring in collisions of the evolved molecules and atoms with the walls of graphite tube. Diffusion of oxygen containing species out of the boundary layer is facilitated by annihilation of oxygen and reduction of oxide on the graphite surface, while interaction of metal vapor with graphite slows down transport of atomic vapor out of the atomizer. These assumptions are used as the basis for the presentation of the problem as a system of first order differential equations describing mass and temperature balance in the atomizer. Numerical solution of the system of equations provides the simulation of temporal composition of the sample constituents in condensed and gas phase in the atomizer according to chemical properties of the analyte and experimental conditions. The suggested approach avoids the description of atomization processes via kinetic parameters such as activation energy, frequency factor, surface coverage or reaction order.
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Journal articles
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