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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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bernaljr20031 bernaljr20031
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6 years ago

Helium is the carrier gas of choice for a gas chromatograph containing a thermal conductivity
  detector, and nitrogen gas is preferred for a gas chromatograph having a flame ionization
  detector. Suggest a reason for this.

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wrote...
#1
6 years ago

Helium has a very high thermal conductivity, thus maximizing the response when compounds
of low thermal conductivity pass the detector. In addition, all organic compounds show a peak
response that rises above (rather than falls below) the baseline. Nitrogen has a lower thermal
conductivity than helium, but is much less expensive. In a flame ionization detector, thermal
conductivity is of no consequence; therefore, nitrogen is preferred.

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