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Necessary reasons why china ph meter digital electrodes need to be soaked
The china ph meter digital electrode must be soaked before use, because the pH bulb is a special glass membrane with a thin hydrated gel layer on the surface of the glass membrane, which can only interact with the H+ ions in the solution under fully wet conditions. There is a good response. At the same time, after soaking the glass electrode, the asymmetric potential can be greatly reduced and tend to be stable. pH glass electrodes can generally be soaked in distilled water or pH4 buffer solution.
It is usually better to use pH4 buffer, and the soaking time is 8 hours to 24 hours or longer, depending on the thickness of the bulb glass membrane and the aging degree of the electrode. At the same time, the liquid junction of the reference electrode also needs to be soaked. Because if the liquid junction dries up, the liquid junction potential will increase or become unstable, the soaking solution of the reference electrode must be consistent with the external reference solution of the reference electrode, that is, 3.3mol/L KCL solution or saturated KCL solution, soaking time Usually a few hours. Therefore, for the pH composite electrode, it must be immersed in a pH4 buffer solution containing KCL, so that it can act on the glass bulb and the liquid junction at the same time.
The above is the relevant content of china ph meter digital electrode soaking, I hope it can be helpful to everyone.