An apparatus is described for carrying out volumetric analysis wherein the cessation of heat change indicates the equivalence-point. Titrant is added a t constant rate to the titrand so that the voltage output of a thermistor temperature transducer varies linearly with time up to the equivalence-point. The voltage change is electronically differentiated to give a square wave of time period equal to the titre. A timing counter is automatically started at the origin of this square wave and stopped when it begins to decline. The titre is thus given in a digital form. The titrator will operate with titrations giving rates of temperature change greater than 0.01" C per second, and results are given for several different titrations.
The following are summaries of papers presented at the Joint Meeting of the Midlands Section of the Society and the Birmingham and Midlands Section of the Royal Institute of Chemistry held on September 15th, 1965, and reported in the October issue of Proceedings (p. 147).flow and the delivery of the titrant and in electronic amplification of the signal that was received from the thermistor.Further development had depended on the particular rate of delivery of titrant.
The usefulness and applications of thermometric methods of chemical analysis are discussed, with particular reference to automated routine volumetric analysis. Titrations have been performed with a constant-deliveryrate syringe burette, and the temperature change of the titrand has been followed by means of a thermistor bridge feeding a recording millivoltmeter. The method is widely applicable and can be made sufficiently rapid to make strict ambient temperature control unnecessary. Consecutive end-points of different components of mixtures may be detected in one titration by using single-or two-component titrants.
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