How to Clean the Electrode of Karl Fischer Titrator

The titrator is an instrument used for chemical analysis, mainly used to determine the concentration of a component in a solution. It is widely used in quality control, inspection, analysis, research and development, etc. Karl Fischer titrator is one type of titrators, mainly used to determine the water content in a sample.

Generally, alcohol is used to clean the electrode of Karl Fischer titrator:

1. Turn off all power supplies.

2. Disconnect the electrode from the port.

3. Remove the anolyte and catholyte.

4. Wipe the grease around the sliding area with alcohol.

5. Rinse the internal burette with alcohol and fill it with about 10mL of alcohol and place it in a beaker. Fill the alcohol in the beaker to the level of alcohol in the internal burette and keep it for about 30 minutes.

6. After the above 5 steps, dry the internal burette.

If the color of the internal burette or diaphragm does not disappear, and when there is iodine deposition on the diaphragm or electrode surface, clean the electrode of Karl Fischer water content titrator with 1mol nitric acid (boiling):

1. Immerse the diaphragm or electrode surface in nitric acid and boil it with a hot stirrer.

2. Drain the chromate in the battery and rinse it with pure water for 2 to 3 times until the light yellow color disappears.

3. Clean the internal burette with alcohol.

4. If the dirt does not fall off, repeat the above steps several times.