As per our reaction condition, we want to measure pH at temperature range of -10 to -40 °C. The available pH electrode has KCl solution that freezes at this temperature range. The reactions are very sensitive to pH.
Please suggest the other available electrodes or alternate ways.
You probably need an ISFET (solid state) electrode.
The problem of a reference electrode remains ... it will depend on the solvent you're working with, which I assume is not water at -40°C. A ferrocene (fc/fc⁺) reference might do the trick.
Although obviously not up-to-date, the following reference still provides a particularly clear and valuable introduction to pH measurements in nonaqueous solvents, while it also discusses the effect of temperature on acid-base equilibria: Herbert A. Laitinen & Walter E. Harris, “Chemical Analysis ─ An Advanced Text and Reference”, 2nd ed., McGraw-Hill Kogakusha, International Student Edition, 1975; cf. section 3-9 and ch. 4.
You may work with two Hydrogen electrodes.
One Hydrogen electrode is placed in your liquid, the other hydrogen electrode in a reference liquid with a known pH value (and a liquid junction to your liquid). The refernce liquid may be a concentrated sulfuric or phosphoric acid.
You have to calcluate the liquid junction potential (the ions of your liquid and the ions of the reference liquid) by the Hendersson formular.
Should be managable
www.reference-electrode.info
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