Electrochemical reference electrode

• Main Author: MARSONER,HERMANN
• Format: Patent
• Language: English; German
• Published: 10.12.1981
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

Electrochemical reference electrode for the potentiometric measurement of ion concentrations, consisting of an electrode body made of electrically insulating material, in which there is a cavity which via an orifice in the electrode body can be brought into contact with the sample to be examined and in which a reversible reference electrode of the second type, preferably of type Ag/AgCl is enclosed. The object of the invention is to provide a liquid bridge which has a low electrical junction resistance, permits the potential to be established rapidly and precludes mixing of electrolyte solution with the sample. Furthermore, an arrangement was required which is suitable, even for very small construction, for analysing micro-amounts of biological fluids. This object is achieved by the electrode body orifice, which leads to the sample, being sealed by a synthetic, hydrophilic, organic gel which contains an aqueous solution of a neutral salt or neutral salt mixture, and the cavity being wholly or partly filled by this salt solution and/or this gel.