pH Electrode storage solution

Proper pH electrode storage will maximize electrode performance and extends electrode life. It's waste of time and annoying to find an electrode inoperative and not ready for use. Make it a habit to store your electrodes correctly.

Clean

Directly after use and before a period of storage, clean your pH electrode.

Never store an electrode dry

pH glass electrodes need to be kept moist at all times. If an electrode dries out during storage, a regeneration procedure is required to restore the hydrated glass layer and the reference junction in order to make the electrode operable.

Recommended pH electrode storage solution

pH electrode storage

Use the solution recommended by the manufacturer, see the instruction manual for the electrode. However, as a general rule, store your pH electrode in the same solution as the reference electrolyte of the electrode. In most cases this is a 3 mol/l KCl solution. Electrodes with a bridge electrolyte should be stored in the electrolyte of the outer electrolyte compartment.

Most electrodes are shipped with a protective cap. Fill the protection cap with storage solution. Close off the filler opening if there is one.


Alternative

Should a reference electrolyte solution not be available, an appropriate substitute is a storage solution of 1 gram of potassium chloride (KCl) per 200ml of either the buffer 4 or 7.


Check regularly

Periodically check to verify that the storage solution has not evaporated. If needed, refill the protection cap with the storage solution.

Never store your electrode in water

DO NOT store your pH electrode in distilled or deionised water as this will cause ions to leach out of the glass membrane and reference electrolyte, causing a slow and sluggish response.

Long-term storage

For storage several weeks, some manufacturers recommend to store their liquid-filled pH electrode dry. To store a liquid-filled electrode dry, you must first remove the internal solution, rinse the electrode in distilled or deionized water, and then let it dry. For more information on long-term storage, refer to the instruction manual of the pH electrode.


Aging

The reason to store a liquid-filled electrode dry is to slow down the aging of the glass membrane. The glass membrane will deteriorate gradually even when not in use. A wet stored electrode is aging faster than a dry stored electrode.

Remember

Electrodes have only a limited shelf-life. Stocks on hand should be used up within a year.

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Non-glass electrode storage 
Just a reminder, non-glass ISFET sensors store dry, need no maintenance and have an indefinite shelf life. Always store the probe with the protective cap …

Bad readings Not rated yet
Are ph reading is way off compared to are Controller reading. I found out that the Chemical co. is putting distilled water In are storage solution bottle …

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