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What does solid phase extraction achieve?

  • A.Removal of dissolved gases from the sample
  • B.Clean-up and concentration of the analyte together
  • C.Separation of the analyte from its isomers
  • D.Conversion of the analyte to a detectable derivative

Answer: B

Passing the sample through a small bed retains the analyte while interferences wash through, and eluting into a small volume concentrates it at the same time. Isomer separation is the column's job, derivatisation is a chemical step, and degassing is unrelated. Achieving two objectives in one operation is why the technique so often precedes a difficult determination.

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