OXYGEN ANALYSIS

• Samples are weighed precisely into silver capsules and dropped at pre-set times into reaction tube (at 1050°C). A constant stream of helium is maintained through tube in sample to carbon monoxide.
• Carbon monoxide is separated from other gases on a chromatographic column and quantitatively measured by a thermal conductivity detector.

Interferences

The technique is generally free of interferences for compounds containing only carbon, hydrogen, nitrogen, oxygen, sulphur, chlorine, bromine or iodine.

• Fluorine interferes significantly due to its ability to liberate oxygen from the glass components in the system.
• Alkaline metals, alkaline earths, lanthanide and actinide series, silicon and other elements that form thermally stable oxides not reduced by carbon can induce significant errors.
• Phosphorus compounds can poison the carbon catalyst sufficiently to passivate its performance.

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