On the kinetic analysis of DTA curves

It is shown that methods of kinetic analysis, which have been developed for DTG, are not directly applicable to DTA. This is because the reaction rate, -dx/dt, is not proportional to the DTA signal ΔT, but rather to ΔT + (C/K)d(ΔT)/dt, where C is the heat capacity of the sample and K is the heat transfer coefficient. Only when the sample is small, the error arising from using these methods for DTA is negligible. This is demonstrated for 'computer DTA curves'. A method for the kinetic analysis of general DTA peaks is suggested.