Electrodes are stored in the cap of storage solution supplied by istek.
Membrane must be kept wet. If there is no storage solution, pH 4 buffer is best for the single glass electrode and saturated KCl is preferred for a calomel and Ag/AgCl reference electrode. Saturated KCl is the preferred solution for a combination electrode.
Electrode is sometimes stored in distilled water, but this method causes electrode life to decrease.
B) pH Electrode Maintenance (Electrode Cleaning)
Electrodes which are mechanically intact with no broken parts can often be restored to normal performance by one of the following procedures: Glass electrodes fail because of scratches, deterioration or accumulation of debris on the glass surface.
* General Cleaning
Soak the electrode in a 0.1-0.5% liquid detergent solution in hot water with vigorous stirring for 15 minutes.Place junction under warm, running tap water for 15 seconds.Drain/refill the reference chamber.Soak the electrode in storage solution for at least 10 minutes.
* Salt deposits
Recover electrode by alternately immersing it three times each in 0.1N HCl and 0.1N NaOH for approx. five minutes. If this fails, immerse tip in KCl solution for 30s. After recovery, soak in pH 7.00 buffer overnight. Rinse and soak in pH 7.00 buffer. Rinse again with distilled water before use
* Oil/Grease films General Cleaning
Remove Oil/Grease films with detergent, and then rinse electrode with distilled
water.
* Clogged Reference Junction
Heat a diluted KCl solution to about 60¡80¡É. The electrode use be stored
in this solution for approx. 10 minutes, then cool electrode in not heated
KCl solution.
* Protein deposits
Dissolve the deposit by immersing the electrode in a 1% pepsin solution with a background of 0.1M HC1 for five minutes, followed by thorough rinsing with distilled water.