DTA-EGD-GC Coupled Simultaneous Thermal Analysis Curves

The DTA-EGD-GC on-line coupled simultaneous technique and associated equipment have been in use since the 1980s [1-3]. The principles and applications in various areas of science of the DTA-EGD-GC technique were outlined in Part I, Sections 2.4.3 and 5.3.1. 

The EGD curve traces the variations on the DTA curve. The feature of an endotherm or exotherm on the DTA curve enables one to detect whether it is due to a physical process or a chemical process. 

According to the calibration line of the evolved gas which was released in the process of the thermal decomposition of samples, each chemical reaction can be detected while applying the quantitative method of EGD, i.e. the QEGD method [3j. 

According to the variations on the DTA-EGD curves, relevant components of the reaction gases evolved at any temperature can be intercepted and analyzed by GC by operating a sampling valve at certain intervals. 

The sampling of the reaction gases evolved can be employed not only under programmed 

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