Linear and Parabolic Rate Constants





           Fig. 3 Illustration of the two oxidation rate regimes. [3]


The equation d02 + Ad0 =B(t+t) has two important limiting conditions:


1.      One limiting case occurs for long oxidation times and we get                       


d02 = Bt


This is called Parabolic Law and B is the parabolic rate constant.  This is diffusion-controlled case.


2.      For short oxidation times we get


d0 = B(t+t) / A


This is called Linear Law and B/A is called the linear rate constant and it is a reaction-controlled case. [3] [2]