What distinguishes pH combination electrodes that are rechargeable from those that are not?
The pH composite electrode's housing is divided into glass and plastic parts. A liquid filling hole is present on the electrode shell of the rechargeable pH composite electrode. The liquid filling hole can be opened to resupply the KCl solution if the electrode's external reference solution is lost. The non-rechargeable pH composite electrode has no liquid filling hole and is filled with KCl gel, which is difficult to lose.
The liquid junction potential of the rechargeable pH composite electrode is stable and reproducible, and the measurement accuracy is good. The reference solution also has a high penetration rate. The KCl solution can also be refreshed or replaced when the reference electrode is depleted or polluted, but this has the drawback of being difficult to utilize. The liquid filling hole should be left open when using the rechargeable pH composite electrode to raise the liquid pressure and hasten the electrode reaction. A fresh supply of dielectric liquid needs to be added as soon as it drops 2 cm below the liquid filling hole.
The non-rechargeable pH composite electrode is popular because to its ease of use and straightforward maintenance. However, the KCl concentration at the liquid junction may decrease when used as a laboratory pH electrode under long-term and continuous use conditions, which will impact the test accuracy. Therefore, non-rechargeable pH composite electrodes should be soaked in electrode soaking solutions when not in use in order to ensure excellent electrode performance for the subsequent test. Some laboratory pH electrodes are not suitable for long-term and continuous tests. Consequently, this structure Accuracy is only minimally affected.Consequently, this structure Accuracy is only minimally affected. The industrial pH composite electrode is the preferred option since it is simple to use and has relatively low test accuracy requirements.
