gas chromatography Flashcards
1
Q
what is the stationery phase in gas chromatography?
A
normally a liquid, sometimes solid on an inert solid support
2
Q
what is the mobile phase in gas chromatography?
A
inert gas (usually N/He) that passes through the liquid
3
Q
summarise the method of gas chromatography
A
- sample injected into machine, sample becomes vaporised
- injector is contained in an oven
- sample boils and is carried in thin column by carrier gas (mobile phase)
- column contains stationery phase
- sample that is most adsorbed takes longer to leave and enter detector
4
Q
what is the retention time?
A
time taken to travel through chromatography column to the detector
5
Q
what does retention time depend on?
A
- solubility in stationery phase
- speed of gas flowing
6
Q
what is produced after gas chromatography?
A
- each compound produces a peak
- each have different retention times
7
Q
what does the area under each peak show?
A
amount of component present
