Apparatus for measuring ion concentrations

摘要

An apparatus for measuring ion concentrations using the voltage, originating from an electromotive force, between two electrodes (1, 2) immersed in a sample solution (3) comprises a device for measuring the internal resistance of the source of the electromotive force. The device for measuring the internal resistance comprises a current source (8) for generating an alternating current between the electrodes (1, 2) whose output voltage is an alternating voltage which has a direct voltage (EPH) corresponding to the electromotive force superimposed on it. A measurement circuit (11) measures the voltage drop produced across the internal resistance by the alternating current.