S SULPHUR ANALYSIS

  • Samples are precisely weighed precisely into tin capsules and dropped at pre-set times into combustion tube (at 1000°C). A constant stream of helium is maintained through tube.
  • Helium stream replaced by pure oxygen for brief period prior to sample introduction.
  • Sample instantaneously burned (flash combustion) followed by intense oxidation of tin capsule at 1800°C.
  • Resulting combustion gases passed over catalysts to ensure complete oxidation.
  • Gas stream dried by means of a water scrubber. 
  • Excess oxygen removed as gases are swept through reduction tube containing copper at 650°C
  • Finally sulphur dioxide is separated from other interfering gases on chromatographic column and quantitatively measured by thermal conductivity detector.

Interferences

The technique is generally free of interferences.

  • Some inorganic materials may not liberate sulphur immediately, this can be remedied with the addition of additives to sample.
  • A few compounds that contain phosphorus may form thermally stable compounds that may bind some sulphur.

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