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- Posts: 181
- Joined: Tue Oct 28, 2008 9:54 pm
- Location: usa
Here is my method:
isobutyl alcohol, bp=108C
Headspace:
oven loop transfer: 90C 105C 110C
vial eq time: 30min
pressure time: 0.20min
pressure eq time: 0.10min
loop fill time: 0.10min
loop eq time: 0.10min
inject time: 1.0min
Inlet:
5:1 split
temp: 140C
temp gradient: 40C to 240C
Col dimensions: 30m length, 320um dia, 1.8um thickness of film
Flow: 1.5 ml/min
Issue:
I am observing a little peak eluting before the standard peak at the base. This standard is USP and claims to be pure. So I think it's an instrument issue.
What could cause a false little peak like this to show up?
https://ibb.co/jgN3qc
<a href="https://ibb.co/jgN3qc"><img src="https://thumb.ibb.co/jgN3qc/2018_02_07_extra_peak.png" alt="2018_02_07_extra_peak" border="0"></a>
<a href="https://ibb.co/jgN3qc"><img src="https://preview.ibb.co/dHJbAc/2018_02_07_extra_peak.png" alt="2018_02_07_extra_peak" border="0"></a><br /><a target='_blank' href='https://imgbb.com/'>free picture hosting site</a><br />
Analytical Chemist and Adventurer
Venture Industries
Spider-Skull Island