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What interference does a plasma suffer more than a flame?

  • A.Physical differences in sample viscosity
  • B.Spectral overlap between many emitted lines
  • C.Chemical suppression by phosphate
  • D.Ionisation of the easily ionised metals

Answer: B

Exciting every element produces thousands of lines, and overlaps between them are the plasma's characteristic problem, demanding a high-resolution spectrometer and careful line selection. Chemical suppression is largely absent, ionisation is severe but corrected by the technique's own standards, and viscosity affects both alike. A technique that measures everything at once must also cope with everything at once, which is where its complexity comes from. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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