CHN |Total Carbon, Hydrogen, Nitrogen

  • Samples 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 the tube.
  • Helium stream replaced by pure oxygen for a 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, sulfur and other interferences.
  • Gases are then separated on chromatographic column into N, C, and H. These gases are quantitatively measured by a thermal conductivity detector.


This technique is generally free of interferences

A few silicon and organo-metallic compounds exhibit a tendency to form stable carbides.
Samples containing phosphorus may not combust successfully and give low carbon values.
The analysis of numerous fluorine containing compounds will cause errors in the hydrogen result.

All the above problems can be remedied with the addition of additives to the sample.

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