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What does standard additions not correct for?

  • A.Ionisation of the analyte in a hot flame
  • B.A spectral interference at the analytical line
  • C.A viscosity difference between sample and standards
  • D.Chemical suppression by phosphate in the matrix

Answer: B

A spectral overlap adds a constant absorbance whatever the analyte concentration, so it shifts the whole line upward and the extrapolated intercept is wrong. The other three all scale with the analyte and are handled correctly. Knowing which interferences a technique corrects and which it merely carries along is what prevents it being trusted beyond its reach.

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