Atomisation in graphite furnace atomic absorption spectrometry: atmospheric pressure vis-à-vis vacuum vaporisation
Journal of Analytical Atomic Spectrometry Pub Date: DOI: 10.1039/JA9860100359
Abstract
Arrhenius plots were prepared from signals obtained for the atomisation of Pb, Bi and Au from a graphite surface at atmospheric pressure and in vacuum at 10–9 atm. Spatially integrated absorbance was recorded for atmospheric pressure studies and mass spectral intensity for vacuum runs. Comparison of activation energies (Ea) calculated from the leading edges of the signals showed no significant differences between atmospheric and vacuum vaporisation. The Ea values are thus not influenced by potential radial inhomogeneities in the vapour densities within the tube. For the elements and conditions used in this study, Arrhenius data support a vaporisation model that assumes the analyte to be present on the graphite surface in the form of microparticles as opposed to a monolayer.
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Journal Name：Journal of Analytical Atomic Spectrometry
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CAS no.: 89640-58-4
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