How to properly use a combined pH electrode?
There should be no bubbles at the front end of the bubble. If there are bubbles, they should be forcefully thrown away.
After the electrode is taken out of the soaking bottle, it should be shaken in deionized water and shaken dry. Do not wipe the bulb with a tissue, otherwise the static induced charge will transfer to the glass membrane, which will prolong the time for the potential to stabilize. A better method is to rinse the electrode with the tested solution.
After inserting the pH composite electrode into the measured solution, it should be stirred and shaken a few times before being placed still, which will accelerate the response of the electrode. Especially when using a plastic shell pH composite electrode, the stirring and shaking should be more severe because there is a small cavity between the bulb and the plastic shell. After the electrode is immersed in the solution, sometimes the gas in the cavity cannot be eliminated in time, resulting in bubbles and poor connection between the bulb or liquid interface and the solution. Therefore, it is necessary to stir and shake vigorously to eliminate the bubbles.
After testing in the viscous sample, the electrode must be repeatedly rinsed with deionized water multiple times to remove the sample adhered to the glass film. Sometimes it is necessary to wash the sample with other reagents first, then rinse it with water to remove the solvent, and immerse it in the soaking solution for activation.
Avoid contact with strong acids, alkalis, or corrosive solutions. If testing such solutions, try to minimize immersion time and carefully clean them after use.
Avoid using in dehydrating media such as anhydrous ethanol and concentrated sulfuric acid, which will damage the hydrated gel layer on the surface of the bulb.
The shell material of the plastic shell pH composite electrode is polycarbonate plastic (PC). PC plastic can dissolve in some solvents, such as carbon tetrachloride, trichloroethylene, tetrahydrofuran, etc. If these solvents are present in the test, the electrode shell will dissolve. In this case, a pH composite electrode with a glass shell should be used instead.
