Beckman Industrial Corporation

R Murty Neti

John N Harman, Iii

A normal pH sensitive glass electrode is deactivated by exposure to thermal treatments at relatively high temperatures of approximately 190.degree. C. for predetermined periods of time until the nominal electrode sensitivity is reduced to very low levels such that the output potentials of such deactivated glass electrode approach the characteristics desired for a theoretically perfect reference electrode. Additionally, a method of forming a deactivated pH glass electrode including the steps of exposing a normal pH or other ion sensitive glass electrode to high temperatures in the order of 190.degree. C. or higher for predetermined periods of time is disclosed. Additionally, there is disclosed an electrode measuring assembly for use in a potentiometric measuring system including, a vessel having a sample solution to be measured therein and a pH measuring electrode pair consisting of a normal pH sensitive glass electrode half cell and a deactivated pH glass electrode half cell disposed in spaced relation and immersed in the sample solution in said vessel, to be measured. The respective normal pH sensitive glass electrode half cell and the deactivated pH glass electrode are calibrated by suitable buffer solutions and a variable span analyzer before the electrode measuring assembly is connected into the potentiometric measuring system.

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Brea, CA, United States of America

R Murty Neti