Analytical methods
Identity confirmation versus purity
Two separate analytical questions that are often reported as if they were one.
5 min read
Identity testing asks whether the material is the substance it is labelled as. Purity testing asks how much of the sample is that substance, and what else is present.
A sample can be correctly identified and still be impure, and a high purity figure attached to an unconfirmed identity tells a reader very little.
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