Discussion
What limits headspace sampling?
Answer: D
An analyte must partition appreciably into the vapour to be sampled at all, so involatile compounds are invisible however much is present. Solids work perfectly well, the vial is heated well below boiling, and many analytes are measured together. That the technique's chief advantage and its chief limitation are the same property is worth recognising before it is chosen for an unfamiliar analyte. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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