Quasi-stationary-state and partial equilibria approximations

1 -Quasi-stationary-state and partial equilibria approximations a) Quasi-stationary-state approximation (QSSA) 

This technique has already been defined and used for simple mechanisms (Chapter VIII). A complex reaction mechanism which is described by the following system of ordinary differential equations is considered here  

Chapter XIII - Analysis and reduction of reaction mechanisms 

It is possible to go further in this approach and proceed to eliminate the quasi-stationary species by solving equations (35). 

The solution of this system gives the equations of the reduced manifold of dimension 

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