FIELD: analytical chemistry, quantitative determination of substances in aqueous-organic systems, laboratory or remote control over concentration of substances in extraction and other technological processes. SUBSTANCE: electrode with punctured membrane is employed to determine abrupt change of potential in organic phase. Difference of emf of electrode with membrane and without it prevents abrupt changes of potentials of auxiliary electrodes and corresponds to abrupt change of potential in membrane proper. Abrupt changes of potentials of auxiliary electrodes in this case can have any value and can vary in time in addition. EFFECT: possibility of employment of stainless steel electrodes in the capacity of auxiliary electrodes. 2 dwg
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