Discussion
Consider the following pairs of quantity and how it is obtained.
Identity - Retention time or spectrum
Amount - Peak area against a calibration
Efficiency - Retention time and peak width
Selectivity - Peak height ratio of two compounds
How many of the pairs given above are correctly matched?
Answer: C
The first three are correct and the fourth is not, so three match. Selectivity is the ratio of two capacity factors, a retention property, and has nothing to do with peak heights, which reflect amount and shape. Each quantity is read from a different feature of the same trace, and knowing which feature carries which information is most of reading a chromatogram properly.
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