Determination of oxygen in oxides by carrier gas hot extraction analysis with simultaneous COx detection |
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Authors: | Wolfgang Gruner |
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Institution: | (1) Institute of Solid State and Materials Research Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany, DE |
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Abstract: | The determination of oxygen by carrier gas hot extraction is the most popular method for oxygen analysis, but its application
to high oxygen contents in oxides requires a critical look at the basic assumptions of the method. The process was studied
for various oxides (Al2O3, Bi2O3, Cr2O3, Fe2O3, MoO3, NiO, TiO2, WO3, Y2O3, and ZrO2) using a modern analyser with IR-detectors for CO2 and CO. There was a difference specific to oxides that must be known to get the required analytical results with high precision
and accuracy. High amounts of CO2 were formed particularly from Bi2O3, Fe2O3, MoO3, NiO, and WO3. The reaction rate can be controlled with delayed heating of the furnace, so that an oxide sample weight of up to 100 mg
can be used.
Received: 13 April 1999 / Revised: 24 June 1999 / Accepted: 28 June 1999 |
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