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What does an ionisation suppressant do?

  • A.Chemically binds the analyte to prevent its ionisation
  • B.Cools the flame locally around the light path
  • C.Removes the interfering element before atomisation
  • D.Floods the flame with electrons from an easily ionised salt

Answer: D

Adding a large excess of caesium or potassium produces so many free electrons that the analyte's own ionisation equilibrium is pushed back towards neutral atoms. It does not bind the analyte, cool the flame or remove anything. Shifting an equilibrium by flooding the system with one of its products is a general chemical technique, and here the product is the electron.

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