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How is selectivity changed in practice?

  • A.By altering the eluent or the stationary phase
  • B.By using a longer column of the same type
  • C.By reducing the particle size of the packing material used
  • D.By raising the flow rate through the column

Answer: A

Selectivity depends on the chemistry - the organic modifier, the pH, the buffer and the bonded phase - and not on the column's dimensions. Length and particle size change efficiency, and flow rate changes efficiency and time. That the most powerful lever is a chemical one rather than a physical one is why method development begins with solvent screening rather than with hardware.

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