Discussion
How does on-column injection avoid discrimination?
Answer: C
Depositing the liquid inside the column itself removes the vaporisation step where discrimination occurs, so the composition reaching the stationary phase is the composition injected. Slower vaporisation and a zero split reduce the problem without removing it, and injector temperature is a related but separate control. Eliminating a step rather than optimising it is the more reliable fix when that step is the source of the error. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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