Abstract
A technique has been developed for both quantitative and qualitative thermal analysis using a katharometer to measure evolved gases quantitatively and a differential freezing technique to aid in the identification of the gases produced. The technique results in a great increase in sensitivity when compared with DTA and conventional EGA techniques using a hot wire detector, and offers the advantages of simplicity and low cost. To offset this there are certain limitations but nevertheless the method is applicable to many problems in quantitative differential thermal analysis. The procedure enables DTA equipment to be used conventionally or with simultaneous monitoring of either the total gas evolved, or a specific gas. In the latter case, with minor modifications to the technique, an increase in sensitivity of > 1000X can be obtained, making the detection and measurement of trace quantities of impurity possible. The method has been applied successfully to the identification and determination of carbonate impurity in silver (II) oxide, at levels of well below 1% CO2.
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