Discussion
Which of the following gases are used as carrier gas in GLC ?
(a) Hydrogen
(b) Acetylene
(c) Nitrogen
(d) Nitrous oxide
Choose the correct answer from the options given below :
Answer: A
The carrier gases are (a) and (c) only: hydrogen and nitrogen.
In gas-liquid chromatography the carrier gas must be inert towards the sample and the stationary phase and suit the detector. Helium, nitrogen, hydrogen and argon are used; nitrogen is cheap, and hydrogen gives fast analyses with good efficiency.
Acetylene and nitrous oxide are reactive gases. They are used as fuel and oxidant in the flame of atomic absorption spectroscopy, not as carriers in GLC, which is why any option containing (b) or (d) is wrong.
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