Gas Chromatography

Theoretical plates are used to

A:

estimate the efficiency of a column

B:

determine the thickness of the stationary phase

C:

measure the distribution of the analyte between mobile and stationary phases

D:

None of the above

Answer: A

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What does the retention factor, k', describe?

A:

The distribution of an analyte between the stationary and the mobile phase

B:

The migration rate of an analyte through a column

C:

The velocity of the mobile phase

D:

All of these

Answer: B

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Split injection is carried out by

A:

splitting the sample into smaller portions to inject sequentially

B:

splitting the sample into smaller portions to inject at the same time through parallel ports

C:

splitting off some of the sample so that it does not enter the column

D:

none of the above

Answer: C

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Headspace analysis is carried out in order to

A:

analyse volatile compounds from solid or liquid samples

B:

determine the psychological state of the tutor

C:

analyse the column contents ahead of the sample

D:

determine non-volatiles

Answer: A

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

A:

Electron capture detector

B:

Field ionisation detector

C:

Thermal conductivity detector

D:

All of the above

Answer: B

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Questions for: Gas Chromatography