Choice of Carrier Gas

 AdvantagesDisadvantages
Hydrogen
  • Cheap
  • Gives the most time efficient separation
  • Still very efficient at high gas velocities ie. 60 cm/ sec
  • Can form an explosive mixture with air
  • Some industries in some countries have regulated AGAINST the use of hydrogen
  • is a reductive gas
Helium
  • Very inert, will not react with analytes
  • Gives a very time efficient separation
  • Non flammable
  • Expensive
  • A non-replenishable resource
Nitrogen
  • Cheap
  • Very inert, will not react with analytes
  • Non flammable
  • Very slow velocity to achieve good efficiency

<< Effect of Carrier Gas and Flow Rate

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