Discussion
What does a certified reference material provide?
Answer: B
A certified material is a real matrix - a soil, a food, an alloy - whose analyte content has been established by several laboratories and methods, so a result on it tests the whole procedure against an accepted value. A pure standard calibrates, a blank measures contamination, and wavelength is checked with a lamp. Validating against a material like the sample, rather than against a pure solution, is what distinguishes accuracy from precision. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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