Choice of Carrier Gas

• 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

• Very inert, will not react with analytes
• Gives a very time efficient separation
• Non flammable

• Expensive
• A non-replenishable resource

• Cheap
• Very inert, will not react with analytes
• Non flammable

• Very slow velocity to achieve good efficiency

Flow Rates >>