  The mathematical model describing the stationary natural pH-gradient arising
under the action of an electric field in an aqueous solution of ampholytes
(amino acids) is constructed and investigated. The model is a part of a more
general model of the isoelectrofocusing process. Investigation is based on the
approximation of a weak solution by the piecewise continuous non-smooth
functions. The method can be used for solving classes of problems for ODEs with
a small parameter at higher derivatives and the turning points.

Chemical Physics;Numerical Analysis