Method of stationary concentration

It is common knowledge that when intermediate products are highly reactive particles, a stationary mode is set in the system in a short time. In this mode concentration of active intermediate compounds is accepted as stationary, i.e. the difference in rates of their accumulation and consumption is very low compared with the reaction rates. Thus, the intermediate product concentration in the conjugated reaction may be determined by the method of stationary concentrations. On the other hand, kinetics of conjugated reactions may be described by an expression deduced from the determinant equation (2.25) not using the stationary concentration method. 

The method used by Zeeman to model the heartbeat and the process of nerve impulse transmission by means of differential equations (see Section 3.5) is frequently employed in chemical kinetics (where it is called the Tikhonov method or the method of stationary concentrations). Application of the method to chemical kinetics equations will be discussed in Chapter 4. 

Having taken advantage of a method of stationary concentration, it is easy to receive the final expressions for the observed speed of the reaction (1) and for the observed action constant (2). 

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