A thermistor as a sensor in gas phase flow injection analysis Original Research Article

A flow injection thermometric procedure based on a flow-through thermometric detector for measuring the heat effects of a physical mixing or a chemical reaction is described. For comparison the following heat delivering systems were studied: mixing of water/water, air/water or air/air; neutralisation reaction of sulphuric acid with sodium hydroxide; and gas phase reaction of carbon dioxide with ammonia in the presence of water vapour. Emphasis was given to the evaluation of the influence of the introduction of a small sample volume into the flow systems and the effect of flow rate on the signal and the sampling frequency.