Fire

Question 1

Temperature programming / profile

Answer 1

Requires to achieve good separation of compounds
1 minute at 50 degrees for low b.p. compounds
10 degrees per minute for 20 minutes
Hold at 250 degrees for 5 minutes for high b.p. compounds

Question 2

Analysis methods

Answer 2

Direct headspace
Adsorption solvent elution
Adsorption thermal desorption
Solvent extraction
Distillation

Question 3

Automated thermal desorption with Tenax TA

Answer 3

Heat at 99 degrees per minute up to 280.
Purge sample from tube into secondary trap
Cool to -30 degrees
Heat secondary trap and introduce sample to GC inlet
Sample is split and the bulk of it may be purged.