Discussion
What does headspace sampling analyse?
Answer: B
Equilibrating a sample in a sealed vial and injecting only the vapour above it delivers the volatile compounds while leaving the involatile matrix behind entirely. Residues, dissolved gases and early fractions are other things. Sampling only what is volatile is both a separation and a clean-up in one step, which is why blood alcohol and residual solvent determinations are done this way.
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