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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