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The surfaces of some solid-state electrodes passivate in time, causing drift, poor reproducibility and loss of response at low levels. The electrode can be restored to good operating condition by repolishing with the abrasive strip enclosed. Polish the electrode before you first use it, and when its performance deteriorates. The abrasive can also be used on solidstate electrodes (bromide, chloride, cyanide, iodide, copper, cadmium, and lead) if the surface has been etched or chemically poisoned.
- Cut off a 1-inch length of polishing strip.
- Hold electrode with the membrane facing upwards.
- Place a few drops of distilled water on the membrane surface.
- With the frosted side down, place the polishing strip on the membrane using light finger pressure.
- Rotate the electrode for about 30 seconds.
- Rinse and soak in a 1 ppm or 10-5 M standard solution for about two minutes before use.
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