Abstract
A review of the literature on the DSC method for purity determination is presented, with a discussion of the most important aspects, i.e. theory, sample handling, calibration of the instrument, evaluation of melting curves, and the conditions and accuracy of the measurement of eutectic impurities. A number of mathematical descriptions of the solid—liquid equilibrium for eutectic binary systems is applied to the calculation of theoretical phase diagrams and specific heat functions, which are then compared with experimental phase diagrams and melting curves. The applicability of the DSC method to systems of solid solutions is discussed. Both the experimental procedure and the evaluation by computer methods required to obtain accurate impurity determinations by DSC are presented. A number of practical examples is included.
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