When a pH-sensitive glass electrode is not actively in use, in what type of solution should it be kept?

When a pH-sensitive glass electrode is not actively in use, in what type of solution should it be kept?

• A. Tap water
• B. Physiologic saline solution
• C. The medium recommended by the manufacturer
• D. A buffer solution of alkaline pH

Answer: (C)

The sensing glass membrane of a pH electrode must stay hydrated and in a stable ionic environment to maintain accurate, fast response and minimal drift. Manufacturers formulate a storage medium that preserves the glass hydration and the reference system; using that specific medium keeps the electrode calibrated and ready for use. Storing in tap water or saline can cause mineral buildup, ionic imbalance, or junction contamination, leading to drift or degraded performance, while an alkaline buffer could alter the electrode’s surface chemistry and potential. Therefore, keeping the electrode in the medium recommended by the manufacturer best preserves its accuracy and readiness.

The sensing glass membrane of a pH electrode must stay hydrated and in a stable ionic environment to maintain accurate, fast response and minimal drift. Manufacturers formulate a storage medium that preserves the glass hydration and the reference system; using that specific medium keeps the electrode calibrated and ready for use. Storing in tap water or saline can cause mineral buildup, ionic imbalance, or junction contamination, leading to drift or degraded performance, while an alkaline buffer could alter the electrode’s surface chemistry and potential. Therefore, keeping the electrode in the medium recommended by the manufacturer best preserves its accuracy and readiness.