Comparison of the energetics of desorption of solution and vapour phase deposited analytes in graphite furnace atomic absorption spectrometry

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DOIResolve DOI: http://doi.org/10.1039/JA9900500311
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TypeArticle
Journal titleJournal of Analytical Atomic Spectrometry
ISSN0267-9477
Volume5
Issue4
Pages311319; # of pages: 9
AbstractThe energetics of atomisation of Pb, Cu, Ag and Au in pyrolytic graphite coated, uncoated electrographite and glassy carbon tubes was studied following deposition of the analyte as a solution (primary site) and as an aerosol vapour (secondary site). Arrhenius activation energies (Ea) for Pb and Cu were independent of tube type and mode of analyte deposition. An apparent first-order rate of release occurs from all tube types and from both primary-and secondary-deposition sites, suggesting that both elements desorb from the surface as individual atoms. Values of Ea for desorption of Ag and Au were independent of furnace tube type but dependent on the deposition mode, with fractional orders of desorption obtained throughout. Data for these elements suggest the formation of micro-droplets or caps (primary site) and islands (secondary site) with desorption occurring from the droplet surface or at the metal-graphite interface.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedNo
Identifier10391186
NRC number1259
NPARC number8900167
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Record identifierc388d46f-6cd4-409e-a24e-2fddc24d8587
Record created2009-04-22
Record modified2016-05-09
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