Using ordinary pH glass electrodes, one encounters problems in pH measurement when the solution pH is about 1 or above 12. In such cases, acid and alkali errors come on the way. A few electrodes of specific make will work in such solutions. Hence one should know how to choose or design pH electrodes which do not cause any problems for pH measurement at pH 1or less than 1 and at pH 12 or above.
I have been working since decades in the area of glass-membrane pH electrodes both in industry and academia and I don’t know any glass sort which would be totally error-free. You should buy a special glass electrode with a small acid and alkaline error. pH-ISFET’s will be much worse.
For sure a Hydrogen / Hydrogen Electrode combination will work.
We produce now for 2 decades Hydrogen reference electrodes. They do work in concentrated 50% hot NaOH as well as in 50% Sulfuric acid. As the hydrogen Potential is the origin of the pH Scale, this electrode will give you the right pH value in any case.
Unfortunately until now you just have to build your own pH electrode out of two hydrogen reference electrodes.
We are at the beginning to produce and sell such kind of pH meter
Hydrogen reference electrode is not suitable for practical application. Only in controlled laboratory environment it works. How could you make it and successfully used it? It will be better if you kindly send the detailed manufacturing procedure or any reference note regarding hydrogen/ hydrogen combination.
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