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What is a modulator used for in that arrangement?

  • A.Switching the detector between the two columns
  • B.Splitting the carrier gas between the columns
  • C.Cooling the second column between fractions
  • D.Trapping and releasing fractions onto the second column

Answer: D

A modulator collects each narrow slice of the first column's effluent, focuses it and injects it rapidly onto the second, many times a minute. Detector switching, gas splitting and cooling are not its function. Because the second separation must finish before the next slice arrives, that column is very short and very fast, which is the engineering constraint the whole technique turns on.

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