My work is on photocatalysis of CO2 into value added products like methanol, ethanol, formic acid, formaldehyde, in water as a solvent (Major phase is water around 99% and 1% may be other component(reduced product)).
Most of the literature has reported GC-FID for the detection and quantification of methanol, ethanol, formic acid, formaldehyde.
But we can’t use water samples in GC-FID.
So is there any way to analyze such samples in GC-FID or any water comfortable columns where we can directly inject water sample for analysis.
Currently we have DB1 ms and and db5 ms column.
FID does not respond to formaldehyde and formic acid. Water gives a negative peak overlapping with methanol. I'm very skeptical to use GC with a FID detector to quantify the products of CO2 reduction in water. There exists a colorimetric assay for formaldehyde. I used it but not remember details.
Hello,
If the concentrations are high enough you can use NMR to quantify the species. You can just add a little D2O to lock (or add it in a capillary). I did that for formate formation in water with borohydride (see: https://www.sciencedirect.com/science/article/abs/pii/S0016236115001477)
What about trying a micro-extraction, where you add a solvent (DCM) that you can separate that will dissolve some of the organics and then inject that? You'd need to make a calibration curve for each species using the same water/solvent ratio as you will use in your experimental extraction because they will partition differently between water and the organic solvent.
Kyle
You could use hydrogen as the carrier has and a little hydrogenation reactor.connectrd to the inlet of the FID (Raney nickel, stainless steel tube 4 mm diameter 100 mm long, 400 degrees Celsius) All your products leaving the column will be converted to methane and will be detected by the FID.
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