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What is a spectral interference?

  • A.The analyte ionising in a hot flame
  • B.The sample's viscosity altering the uptake rate
  • C.Another species absorbing at the analytical line
  • D.The analyte forming a refractory compound

Answer: C

A spectral interference arises when something else absorbs or scatters at the wavelength being measured, so the reading includes a contribution the analyte did not make. Refractory compounds are a chemical interference, ionisation an ionisation interference, and viscosity a physical one. Sorting interferences into four kinds, each with its own remedy, is what makes an unexpected result diagnosable. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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