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Formic acid, méthanol c2-c4 in water by GC-FID
Posted: Wed Dec 05, 2012 1:30 am
by HCRD
Hello,
Is it possible to analyse formic acid, méthanol ADN some C2 to C4 product in water with GC-fid. Détection limit need 50 PPm.
I found this
http://www.labplus.co.kr/tech/uploadHTM ... 4456EN.pdf
Thanks
Re: Formic acid, méthanol c2-c4 in water by GC-FID
Posted: Wed Dec 05, 2012 4:43 am
by chromatographer1
No, the formic acid will not be detected at those levels with a FID.
Use a HID.
See Gowmac, Valco, or AIC.
Matthew, can you assist here?
best wishes,
Rod
Re: Formic acid, méthanol c2-c4 in water by GC-FID
Posted: Wed Dec 05, 2012 1:37 pm
by HCRD
Thanks, with TCD ?
Re: Formic acid, méthanol c2-c4 in water by GC-FID
Posted: Wed Dec 05, 2012 3:55 pm
by chromatographer1
Not with capillary columns, and with packed columns it would be marginal.
Rod
Re: Formic acid, méthanol c2-c4 in water by GC-FID
Posted: Wed Dec 05, 2012 3:56 pm
by chromatographer1
Ion chromatography is the better choice for formic acid.
Rod
Re: Formic acid, méthanol c2-c4 in water by GC-FID
Posted: Mon Dec 17, 2012 3:36 pm
by gcguy
You are probably going to have problems getting the methanol to be reproducible if you are using a split injection with a sample full of water. Formic acid can be done by GC/MS if you have one. With a SIM method I have found the LOD at ~0.1 mg/l in an aqueous sample is easily achievable.
For aqueous samples for voc analysis I have always found splitter discrimination a problem, particuarly with less polar analytes such as toluene. If your sample matrix allows try an on-column injection.
GC guy