Abstract: There are disclosed an ion selective electrode comprising a polyvinyl chloride series resin plate having a through hole; conductive member disposed along the through hole; ion sensitive membrane of a polyvinyl chloride series resin membrane; and a lead wire connected to the conductive member, and the flow type ion sensor comprises a plurality of the ion selective electrodes mutually integrally associated with each other with the interposition of electrical insulating members so that through holes of the respective ion selective electrodes may define a flow passage for a liquid to be measured, and a flow type ion sensor using the same.The ion selective electrode and flow type ion sensor using the same of this invention allow the measurement in a smaller amount of the sample to be measured and are excellect in the adhesion of the ion sensitive membranes, therefore they have effects of a stable potential supply and a prolonged life time, and these industrial merits are highly great.

Abstract: A halogen ion concentration in a solution is measured by bringing halogen ion-selective detection means comprising a silver/silver halide electrode, and a reference electrode into a solution whose halogen ion concentration is to be measured, and measuring an electromotive force of the halogen ion-selective detection means in the presence of silver ions dissolved in the solution. The electromotive force corresponds to the halogen ion concentration in the solution.

Abstract: Disclosed is a method for regenerating an ion-selective electrode equipped with an ion-selective membrane which is formed of a polymer membrane containing an ion-selective material and plasticizer, which method comprises supplying to the ion-selective membrane a regenerating plasticizer which is either identical in every aspects or analogous in effects to the first-mentioned plasticizer and is capable of dissolving the ion-selective material therein and imparting flexibility to the ion-selective membrane. Also disclosed are several embodiments of ion-selective electrodes and ion-concentration analyzers containing means for practicing said method.