6.5.6: Gas chromatography

Question 1

Gas chromatography use

Answer 1

Separates mixtures of volatile liquids so they can be identified

Question 2

The stationary phase

Answer 2

A solid/ a solid coated by a viscous liquid eg: oil, packed into a long column. The column is coiled and built into an oven.

Question 3

The mobile phase

Answer 3

An unreactive gas carrier eg: nitrogen.

The sample is vaporised then passed through the oven.

Question 4

Retention time

Answer 4

From when each component is injected into the column to being recorded at the other end.

Question 5

Under standard conditions each substance will…

Answer 5

Have a unique retention time.

Question 6

GC-MS

Answer 6

Gas chromatography - mass spectrometry

Question 7

GC-MS use

Answer 7

To identify each component and what the original sample consisted of

Question 8

Positive of method if GC-MS instead of GC

Answer 8

Positively identify separate components which can’t done from a chromatogram

Question 9

GC-MS process overview

Answer 9

Sample is separated using gas chromatography then the separated components are fed into a mass spectrometer which produces a mass spectrum for each component.