Biochemistry - Gas Chromatography

Exercise :: Gas Chromatography - Section 1

  • Gas Chromatography - Section 1
11. 

A retention gap is placed between the injector and the front of the column to

A. retain contaminants and prevent them from reaching the column
B. retain the sample and release it gradually to the column
C. prevent backflush of the injected solution
D. all of the above

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

12. 

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: Option B

Explanation:

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13. 

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: Option A

Explanation:

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14. 

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: Option C

Explanation:

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15. 

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: Option B

Explanation:

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