NITROGEN ANALYSIS

Samples are precisely weighed precisely into tin capsules and dropped at pre-set times into a combustion tube (at 950°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 and absorption of halogens, sulphur and other interferences.
  • Excess oxygen removed as gases are swept through reduction tube containing copper at 650°C. Oxides of nitrogen reduced to nitrogen gas.
  • Water and carbon dioxide removed by passing gases through scrubbing tubes.
  • Remaining nitrogen gas is quantitatively measured by a thermal conductivity detector.
  • Protein value is normally calculated using a factor of 6.25 unless otherwise specified.

Interferences

The technique is generally free of interferences.

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