A microcomputer-controlled calorimetric apparatus for slow reactions

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Abstract
A calorimetric system useful for the investigation of small heat effects (down to 25 mJ) and slow kinetics (half-life more than 1 h) is described. Heat exchange effects are cancelled by a double-scan procedure: the heat effect is first acquired and stored as a function of time, then reproduced faithfully by applying controlled heating power, whose integral gives the net heat effect. Acquisition and control functions are performed by a commercial microcomputer, which makes the control electronics cheap and simple. Practical results are given, and the scope of application is discussed, especially in view of kinetic measurements.

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