FIELD: chemistry.
SUBSTANCE: invention relates to field of analytic chemistry and membrane technologies and can be applied for potentiometric determining of ion composition of electro membrane systems. Method of Donnan potential determination lies in measuring EMF of two-electrode cell, in which belt of ion-exchange membrane, like salt bridge, is plunged with one end into solution, whose concentration is close to concentration of membrane internal solution, and with the other end - into investigated solution, measuring is carried out by means of two electrodes of comparison, which respectively contact with investigated and concentrated solutions, electrochemical chain being closed along membrane, and diffusion in phase of membrane and near-membrane layers is infinitely slow with respect to time of experiment.
EFFECT: increasing accuracy and stability of estimation of Donnan potential value.
4 dwg
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