Improved sodium ion selective electrode and method of use.

摘要

An improved dry-operative ion-selective electrode for the determination of sodium ions in aqueous fluids includes a dried internal reference electrode, a dried reference layer and a sodium ion-selective membrane comprising a binder material. The reference layer contains a metal salt and a hydrophilic binder material, and is buffered to a pH of from 4 to 8 with a water-soluble, organic dicarboxylic acid. This electrode can be manufactured with significantly less waste and exhibits improved uniformity in performance.