Observation on Vaporization of Atoms in Tin-Palladium Alloy in Graphite Furnace Atomic Absorption Spectrometry by Means of Electron Microscopy

Palladium has been recognized as a useful matrix modifier, and is widely used to lessen chemical interferences in the graphite furnace atomic absorption. For example, it was found that tin forms an alloy with Pd as the matrix modifier in the graphite furnace, and atomizes explosively in the phases o...

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Bibliographic Details
Published in:Analytical Sciences 1993, Vol.9(4), pp.529-532
Main Authors: YASUDA, Kazuo, HIRANO, Yoshihiro, HIROKAWA, Kichinosuke, KAMINO, Takeo, YAGUCHI, Toshie
Format: Article
Language:English
Subjects:
alloy phase
Analytical chemistry
Chemistry
electron microscopy
Exact sciences and technology
graphite furnace atomic absorption
Observed atomization
Spectrometric and optical methods
tin-palladium alloy
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Summary:Palladium has been recognized as a useful matrix modifier, and is widely used to lessen chemical interferences in the graphite furnace atomic absorption. For example, it was found that tin forms an alloy with Pd as the matrix modifier in the graphite furnace, and atomizes explosively in the phases of alloys such as Pd-Sn, Pd sub 3 -Sn sub 2 , Pd sub 2 -Sn and Pd sub 3 -Sn. One can presume Sn can evaporate before forming an alloy, but when Sn melts and forms an alloy with Pd, the coefficient of activity of this alloy drops suddenly and it does not evaporate in the low temperature range from 200 deg C, the melting point of Sn, to approx700 deg C. The phenomena of excitation of the analyte atom by a co-existing atom such as the matrix modifier were recognized. If vaporization or atomization of Sn-Pd alloy is observed in the atomic level, much knowledge about the atomization can be obtained. For these purposes, we observed vaporization of the atom with a high resolution electron microscope.
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.9.529