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Why does increasing the capacity factor beyond ten help little?

  • A.The selectivity falls as retention rises
  • B.The plate number drops at long retention
  • C.The detector's response falls away for the later peaks
  • D.The capacity term has nearly reached its limit

Answer: D

The term is k over one plus k, which approaches one asymptotically, so beyond about ten there is almost nothing left to gain while the analysis time grows without limit. Selectivity and plate number are not systematically affected, and detector response does not fall. Recognising that a term is saturating is what tells you to stop pushing it and move to another lever.

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