Chromatography Forum

I am currently using a full evaporation technique (FET) and inject the headspace using an ITEX method I have developed.

I have a 1000ppm solution in water. I am taking 50ul of this solution into a 20ml headspace vial and evaporating using an agitator set at 150 degree C.

How do I work out what the concentration of this will be in the gas phase when fully evaporated?

Thanks,
Rebecca

Do you need to know? I just calibrate in terms of liquid phase concentration. Otherwise it is just raw amount (volume*concentration)liq/vial volume.

Also 50ul in a 20ml vial may be too much. You likely won't get full evaporation due to not enough space and you will generate a lot of pressure in the vial. Usually water expands about 1000 fold when it goes from a liquid to gas so about 20ul in a 20ml vial or 10ul in a 10ml vial.