Discussion
Which column would suit a very dilute environmental sample?
Answer: A
With little analyte present the priority is resolution rather than capacity, so a narrow column with a thin film gives the sharpest peaks and the lowest detection limit. Wide bores and thick films buy capacity that a dilute sample does not need, and a packed column is far less efficient. Matching the column's capacity to the sample's concentration, rather than always choosing the most robust, is what gets the last factor of two in sensitivity.
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