Question

Why is important to maintain a constant flow rate for the carrier gas in a Gas Chromatography experiment?

Given equal concentrations, will the response of an FID be equal for propanol and ethanol? Explain.

Answer 1

Sol. It is very important to maintain a constant flow rate for the carrier gas because it is the carrier gas which carries the vapours of the injected molecules in machine. Vapours of the injected components have different interaction with stationary phase which is responsible for the separation of the components leads to the different retention time and if flow rate is not constant then separation of the peaks will not be pathetic.

No, response wiill be different for both because response of FID is based on the number of carbons in the molecule and in both of these molecules number of carbon is different.