These authors presented a new set of expressions for general order [1]. The prior knowledge of the kinetics order is required. The method uses any points of a peak. The mathematical procedure is similar to the one already given in Mazumdar, Singh & Gartia peak shape method (a). Using Eq.(1) for b=1, given in Peak shape method (Christodoulides: first- and general-order) [2], and Eqs.(12) and (13) for b ?1, given in Mazumdar, Singh & Gartia peak shape method (a) [3], and solving them by an iterative method, it is possible to write the following expression for the activation energy

(1)

where

The coefficients C and D are found using the method of least squares for different order of kinetics b in the range from 0.7 to 2.5 and for x=1/2, 2/3 and 4/3. For a particular value of x the coefficients result to be dependent on b and then can be expressed as a quadratic function of b itself. So that, the previous equation can be rewritten as

(2)

Table 1 gives the coefficients for different values of x.