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- Posts: 4
- Joined: Mon Jan 14, 2019 7:45 pm
I am improving my Headspace -GC - FID method for analysis of terpenes. I am struggling with carry over in between runs. I am using the Tekmar HT3 headspace instrument with the following parameters:
Valve oven temp: 160 C
Transfer line temp: 170 C
Standby flow rate: 50 mL/min
Platen/sample temp: 180 C
Platen temp equil time: 0.00 min
Sample equil time: 0.00 min
Mixer: on
Mixing: Level 5
Mixing time: 10.00 min
Mixer stabilize time: 0.00 min
Pressurize: 9 Psig
Pressurize time: 0.50 min
Pressurize equil time: 0.25 min
Loop fill pressure: 9 Psig
Loop fill time: 0.25 min
Inject time: 1.00 min
I have been injecting a Restek Terpene standard mix #1 usinh methanol as the diluent at a concentration of 120 ppm. I have seen a method which uses this headspace unit using headspace-loop split injection at a split ratio of 10:1 but haven't found this parameter when editing the method.
Please let me know if you have any suggestions or ideas.
Thanks,
Taylor