Oxygen Analysis

  • Samples are weighed precisely into silver capsules and dropped at pre-set times into reaction tube (at 1060°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.

The technique is generally free of interferences for compounds containing only carbon, hydrogen, nitrogen, oxygen, sulfur, 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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