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Why is fast chromatography on the second column essential?

  • A.Each fraction must elute before the next arrives
  • B.The detector cannot record slow peaks accurately
  • C.The modulator would overheat during a long run
  • D.The carrier gas would be consumed too quickly

Answer: A

The modulation period sets a hard deadline: whatever the second column has not eluted when the next slice arrives is lost or overlapped. Detector speed is a real requirement that follows from this rather than causing it, and neither overheating nor gas consumption is limiting. A constraint imposed by one part of a system on another, rather than by any component's own capability, is what makes such designs so tightly coupled.

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