Discussion
How is a matrix effect measured?
Answer: A
Spiking a known amount into an already extracted blank matrix and comparing the response with the same amount in solvent gives the suppression or enhancement directly. A blank alone shows interference rather than suppression, duplicates show precision, and two columns test selectivity. Measuring an effect by constructing the two conditions that differ only in it is the general design, and here the difference is the matrix itself. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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