Maintenance and cleaning of electrodes in potentiometric titration acid meter
Preparation and maintenance of electrodes
Preparation of electrode: Before and after using the electrode, rinse the electrode with water and drain the water on the surface. After the outer casing of the double salt bridge reference electrode is cleaned and drained, methanol solution saturated with potassium chloride is added, and then the casing is firmly fixed in the original position, and no bubbles exist in the outer casing to avoid interference with the measurement. After each experiment, it is necessary to timely check whether there are bubbles in the solution in the outer casing. If there are bubbles, it is necessary to add a new solution to remove bubbles. Before each titration, immerse the prepared electrode in water for at least 5min, then wipe away the remaining water for titration. SH108C automatic acid value base value meter
Electrode cleaning: in order to ensure the precision and accuracy of the experiment, electrode cleaning is very important. The electrode for every time after the completion of the titration using the solvent is isopropyl alcohol petroleum ether mixed in sample solution for a thorough cleaning, if the sample is not completely clean residue in electrode, the electrode must be for a thorough cleaning in chromic acid lotion, and then use distilled water rinse the electrode, and will be cleaned, electrode in distilled water for at least 5 min, To proceed to the next titration experiment.