Analysis of cleaning method of impurities and dirt of pH meter and electrode
Because the concentration of the medium measured by the pH meter electrode and the contamination impurities are different, it needs to be cleaned for the next use. In order to maintain the measurement accuracy of the electrode and the activity of the electrode, the following analysis is performed on different impurities attached to the surface of the electrode membrane. . PH electrode cleaning impurities mainly include the following cleaning conditions
1. General dirt: 3%~5% hydrochloric acid, washed with high-pressure water (<689.476kPa);
2. Oil or grease: isopropyl ethanol (wear-resistant ethanol), methanol, other solutions that can remove special grease;
3. PH electrode working under alkaline conditions: W=5%~10% hydrochloric acid solution, W=3%~7% sulfuric acid; mixed solution of concentrated hydrochloric acid and phosphoric acid;
4. PH electrode working under acidic conditions: W=5%~10% hot alkaline solution (>56°C); W=5%~10% hydrochloric acid; W=2%~3% hydrofluoric acid;
5. Sulfate and carbonate: W=5%~10% hydrochloric acid; mixed solution of concentrated hydrochloric acid and phosphoric acid; mixture of sodium sulfite and sodium hydrosulfite;
6. Silicon dioxide or sticky matter: W=2%~% hydrofluoric acid;
Because the pH meter electrodes are extremely delicate, removing the dirt that sticks to the pH meter electrodes requires patience and the use of proper safety equipment during cleaning. Choosing the proper cleaning solution can make this job a little easier. When cleaning, immerse the electrode in the cleaning solution for at least 5 minutes, so that the cleaning medium can penetrate into the dirt. Washing the electrodes twice is an effective solution. First put the electrode in the acid or alkali solution to soak, during the soaking process, use a soft toothbrush to brush the electrode of the electrode to remove dirt. Then choose a solvent to clean. Finally, the sensor should be rinsed and soaked with water or saline solution (KCl). Maintain its active sensitivity and prolong the service life of the electrode.
