Discussion
What does the method of standard additions achieve?
Answer: A
Adding known amounts of analyte to portions of the sample itself produces a calibration whose matrix is identical to the sample's, so any matrix effect applies equally to standards and sample and cancels. It takes considerably longer, still needs a blank, and does nothing for stray light. Calibrating within the thing being measured, rather than against an external standard, is the general answer whenever the surroundings affect the measurement. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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