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- Posts: 16
- Joined: Fri Aug 28, 2020 3:24 am
- Location: New Zealand
Im trying to determine residual ethanol concentration in extracted product, this has previously been sent to external accredited labs for testing but the company has purchased a HS GC FID to do the testing in-house.
Ive worked a method that seems quick and accurate, meeting validation requirements and a good calibration based on ethanol diluted in water at a range of concentrations. Ive run the previously tested samples and the results are coming out much higher than theirs at around 20-40% difference on comparison.
Without knowing the other labs methods i feel like im flying blind.
What parameter might i need to change?
System - Shimadzu HS-10, Nexis GC-2030, FID.
Rearinj Temp 150c
Rearinj Pressure 99.5kpa
Column flow 1.35 ml/min
Split ratio 40
Velocity 32.7 cm/s
Column temp 50c
FID temp 250c
HS Oven temp 80c
Sample line temp 90c
Transfer line temp 90c
Carrier Gas N2
Thank you