How to use pH composite electrode correctly

(1) There should be no air bubbles at the front end of the bulb. If there is a bubble, apply it.
(2) After the electrode is taken out of the soaking bottle, it should be shaken and dried in deionized water. Do not wipe the bulb with a paper towel. Otherwise, the electrostatic induction charge will be transferred to the glass film, which will prolong the potential stabilization time. A better method is Rinse the electrode with the solution being tested.
(3) After the pH composite electrode is inserted into the solution to be tested, it should be shaken a few times and then placed still, which will accelerate the response of the electrode. Especially when using a molded-shell pH composite electrode, the stirring sloshing is more severe, because there is a small cavity between the bulb and the molded shell. After the electrode is immersed in the solution, sometimes the gas in the cavity is too late to be eliminated, so that the bubble is generated. The bubble or liquid junction is in poor contact with the solution, so it is necessary to stir vigorously to remove air bubbles.
(4) After testing in a viscous sample, the electrode must be rinsed repeatedly with deionized water several times to remove the sample adhering to the glass film. Sometimes it is necessary to wash the sample with other reagents, then wash the solvent with water and immerse it in the soak solution to activate.
(5) Avoid contact with strong acid and alkali or corrosive solutions. If testing such solutions, minimize the immersion time and carefully clean them after use.
(6) Avoid use in dehydrating media such as absolute ethanol or concentrated sulfuric acid, which will damage the hydrated gel layer on the surface of the bulb.
The shell material of the molded-shell pH composite electrode is polycarbonate material (PC). PC plastic will dissolve in some solvents, such as carbon tetrachloride, trichloroethylene, tetrahydrofuran, etc. If the test contains the above solvent, it will be damaged. For the electrode housing, the pH composite electrode of the glass housing should be used instead.