A simple modification to a flame-ionisation detector linear amplifier for logarithmic display of gas chromatograms and its use

Abstract

With the addition of a single diode, a linear electrometer amplifier for gas chromatography with flame-ionisation detection has been modified so as to enable it to respond to ionisation currents, over the range 10^–12 to 10^–6 A, in a manner closely approaching logarithmic proportionality. Some chromatograms obtained with this amplifier are included and attention is drawn to the advantages of logarithmic display.