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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