The correct use of the pH meter electrode and precautions

PH meter electrode is a consumable, how to use it correctly, can prolong the time of PH meter electrode? PH composite electrode is divided into 2 composite and 3 composite electrodes. Now let's introduce the issue of how to use it correctly.

1. Before measuring the medium, it should be noted that there should be no air bubbles in the front of the bulb.

2. After the electrode is removed from the soaking bottle, it should be shaken and dried in deionized water. Do not use a paper towel to wipe the bulb. Otherwise, the electrostatic charge will transfer to the glass film, which will prolong the stable time of the potential. A better method is to use the electrode. Test solution rinse electrode.

3. After the pH compound electrode is inserted into the solution to be measured, it should be stirred and shaken for a few times before being placed still. This will speed up the response of the electrode. In particular when using plastic shell pH composite electrodes, the stirring and shaking should be severe, because there will be a small cavity between the bulb and the plastic shell. After the electrodes are immersed in the solution, the gas in the cavity will be too late to exclude air bubbles and make the ball. The bubble or liquid junction is in poor contact with the solution, so it must be stirred vigorously to remove air bubbles.

4. After testing in a viscous sample, the electrode must be washed several times with deionized water to remove the sample adhered to the glass film. Sometimes it is necessary to wash the sample with other solutions first, then wash it off with water, and dip in the soaking solution to activate it.

5. Avoid contact with strong acids and alkalis or corrosive solutions. If such solutions are tested, immersions should be minimized and carefully cleaned after use.

6. Avoid use in dehydrated medium such as anhydrous ethanol, concentrated sulfuric acid, etc. They can damage the hydrated gel layer on the surface of the bulb.

7. The shell material of the plastic shell pH composite electrode is polycarbonate plastic (PC). PC plastic will dissolve in some solvents, such as carbon tetrachloride, trichloroethylene, tetrahydrofuran, etc. If the test contains the above solvents, it will Damage to the electrode housing. Use a glass-encapsulated pH composite electrode instead.