Enthalpimetric analysis, temperature

Figure 5. Temperature measuring circuit (thermistor bridge) and adiabatic cell for enthalpimetric analysis...

In enthalpimetric flow injection analysis, the sample pulses employed are too small to give a thermal steady state, but result in a temperature peak proportional to the enthalpy change and thereby to the substrate concentration. The peak height, the area under the peak, and the ascending slope of the peak are all linearly related to the substrate concentration. Sample introduction of a sufficient duration (several minutes) leads to a thermal steady state resulting in a constant temperature deviation, which is also proportional to the substrate concentration. 

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