Spectroscopic measurement of carbon monoxide in a graphite furnace

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DOIResolve DOI: http://doi.org/10.1016/0584-8547(88)80070-3
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TypeArticle
Journal titleSpectrochimica Acta Part B: Atomic Spectroscopy
ISSN05848547
Volume43
Issue4/5
Pages421438; # of pages: 18
AbstractTime-resolved, direct Spectroscopic measurements of the PCO in an unperturbed high-temperature graphite furnace are reported, based on the attenuation of the CO(0,0) transition at 154.3 nm excited in a hollow cathode discharge. A model is presented to account for the kinetic and “diffusion” control regimes observed for oxidation of electrographite, pyrolytic graphite-coated and glassy carbon tubes. Heterogeneous equilibrium appears to be established only at T ⪢ 2200 K in coated tubes. Above 1500 K, glassy carbon tubes are as reactive toward 02 as coated tubes. The major source of O2 in the unloaded furnace tube is ingress of ambient atmosphere through the sample dosing hole, giving rise to a steady-state PCO of 1.2 × 10−3 atm at 2600 K. Release of oxidants from decomposition of sample matrices and their slow disappearance by diffusion/reaction processes contribute to an elevated PO2, in the tube at temperatures < 2000 K.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedNo
Identifier10274169
NRC number1229
NPARC number8899134
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Record identifier0bb6b0e7-6d38-404b-a4b3-5aa6b0e32fc2
Record created2009-04-22
Record modified2016-05-09
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