Abstract
It has been confirmed that pulses of noble gases injected into the nitrogen carrier gas in a gas chromatograph produce responses from a flame ionisation detector. The responses are caused by a dual perturbation of the ‘blank’ signal resulting from trace impurities in the nitrogen. One type of perturbation is explicable from the theory of vacancy chromatography whilst the other, it is suggested, results from the influence of the noble gas on the net rate of production of charge carriers in the flame. This latter response can be used for gas hold up time measurements.
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