Discussion
Why is a guard column sometimes fitted?
Answer: C
A short length of uncoated tubing catches non-volatile residues that would otherwise accumulate at the head of the expensive analytical column, and is cut back or replaced as it fouls. It adds negligible efficiency, does no cooling, and splitting happens in the injector. Sacrificing a cheap component to protect an expensive one is a standard economy, and it is why dirty samples are tolerable at all. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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