Gas Chromatography
Which of the following detectors give mass flow-dependent signals?

Thermal conductivity detector
Electron capture detector
Field ionisation detector
All of these

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Gas Chromatography
Sample injection is considered successful if

the sample is concentrated at the start of the column
all of the sample in the injector has been added to the column
the sample is homogenously spread along the column
the sample is spread evenly along the column

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Gas Chromatography
What does the selectivity factor describe?

The relative separation achieved between two species
The maximum number of different species which a column can separate simultaneously
None of these
The proportional difference in widths of two chromatographic peaks

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