The response of the hydrogen flame lonization detector to trace quantities of methane, with several flame diluents (e.g., carrier gas), has been re-examined. The effects of the dilu-ents CO2, N2, Ar, Ne, He, Kr and Xe on the response over a wide range of hydrogen and diluent flow rates were investi-gated. An indirect method used for Kr and Xe gave values for the flow rates at maximum responses but did not permit the measurement of absolute responses. From the data, relation-ships were sought between the thermal properties of the diluent gases and their flow rates at the conditions of maxi-mum response. The order of the flow rates at the maximum response was He)> Ne^> Ar} Kr} Xe)> N2"> C 0 2. This order can be related to the thermal properties of the diluents. The responses depended on the flame composition, especially the nature and proportion of the diluent, and a constant flame temperature is implied for all diluents under maximum res-ponse conditions.
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B. A. Schaefer (1977) studied this question.