Enthalpy Calibration of DTA and DSC

The relationship between the peak area (A) of the DTA or DSC curve, corresponding to an 

Basically, there are three approaches to peak area measurement (a) the cut and weigh method, which is accurate to within 5% (b) the planimeter method, which is accurate to within 1% (c) the integrator method, which is more accurate than method (b). It should be noted that when computer-equipped apparatus is used, enthalpy calculations are carried out automatically if the apparatus is correctly calibrated using calibration reference materials. 

The higher the temperature in DTA measurements, the smaller is the peak area for the same heat quantity owing to heat radiation, hence the melting point of chosen calibration material 

Compound or element Melting point oc Enthalpy of fusion Jg  

The heat of transition of a sample can be expressed as follows when it is determined by 

---