A simple non-selective detector for gas phase chromotography, using the measurement of reflected microwave power

A non-selective detector is described which can be used in conjunction with the microwave-excited emissive argon plasma detector. The mode of operation is based on the measurement of reflected power and its use is demonstrated with respect to a range of component vapours and permanent gases. The limit of detection for nearly all the species investigated is in the nanogram range and the detector responded to all compounds examined.