Discussion
Why does a thinner film shorten retention?
Answer: B
Retention depends on how much stationary phase there is to partition into, so halving the film roughly halves the capacity factor. Carrier velocity is set by the pressure, temperature is a separate control, and diffusion out of a thin film is quicker rather than slower. That film thickness moves retention and capacity together, while affecting efficiency in the opposite direction, makes it one of the more consequential choices in specifying a column.
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