Operation of pH composite electrode

(1) There should be no bubbles at the front end of the bulb, if there are bubbles, they should be removed with force.

(2) After the electrode is removed from the soaking bottle, it should be shaken in deionized water and dried. Do not wipe the bulb with paper towels. Otherwise, the electrostatic induction charge will be transferred to the glass film, which will prolong the time for the potential to stabilize. A better method is Rinse the electrode with the test solution.

(3) After the pH composite electrode is inserted into the solution to be tested, it should be stirred and shaken a few times and then placed still, which will speed up the response of the electrode. Especially when using a plastic pH composite electrode, the stirring and shaking is more severe, because there will be a small cavity between the bulb and the plastic shell. After the electrode is immersed in the solution, sometimes the gas in the cavity will be too late to remove the bubbles. The bubble or liquid junction has poor contact with the solution, so it must be stirred and shaken vigorously to eliminate bubbles.

(4) After testing in a viscous sample, the electrode must be repeatedly rinsed with deionized water multiple times to remove the sample adhering to the glass film. Sometimes it is necessary to wash the sample with other reagents first, then wash off the solvent with water, and immerse in the soaking solution to activate.

(5) Avoid contact with strong acids, strong bases or corrosive solutions. If testing such solutions, the immersion time should be reduced as much as possible and carefully cleaned after use.

(6) Avoid use in dehydrating media such as absolute ethanol and concentrated sulfuric acid, as they will damage the hydrated gel layer on the surface of the bulb.

The shell material of the plastic pH composite electrode is polycarbonate material (PC). PC plastic will dissolve in some solvents, such as carbon tetrachloride, trichloroethylene, tetrahydrofuran, etc. If the above solvents are included in the test, it will be damaged For electrode housings, pH composite electrodes with glass housings should be used instead.

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