Atomization Mechanism of Silver Deposited on Pyrolyzed Ascorbic Acid in Graphite Furnace Atomic Absorption Spectrometry

The atomization of 0.2 ng Ag deposited on ascorbic acid pyrolysed at various temperatures was observed and the activation parameters were estimated. The mass of Ag and the pyrolysis conditions were selected to form droplets without any dispersion on a PG wall and active carbon. The kinetic order obt...

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Bibliographic Details
Published inBUNSEKI KAGAKU Vol. 54; no. 7; pp. 621 - 626
Main Authors ITOH, Tatsuya, SHIMOMURA, Hiroshi, NISHIYAMA, Yasuko, IMAI, Shoji
Format Journal Article
LanguageJapanese
English
Published Tokyo The Japan Society for Analytical Chemistry 2005
Japan Science and Technology Agency
Subjects
ascorbic acid
atomic absorption spectrometry
atomization mechanism
kinetic analysis
silver
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Summary:The atomization of 0.2 ng Ag deposited on ascorbic acid pyrolysed at various temperatures was observed and the activation parameters were estimated. The mass of Ag and the pyrolysis conditions were selected to form droplets without any dispersion on a PG wall and active carbon. The kinetic order obtained indicated the formation of Ag aggregates on the active carbon at temperatures below 1560 K and the formation of individually dispersed atoms of Ag on that at temperatures over 1700 K. The degree of interaction between the Ag atom and an active site on the high temperature treated active carbon was increased, resulting from their greater interaction.
ISSN:0525-1931
DOI:10.2116/bunsekikagaku.54.621