Internal buffer solution for glass electrodes, providing stable pH reference potential in electrochemical measurements.
An internal buffer solution is a precisely formulated aqueous solution contained within the glass electrode body, serving as the reference system for pH measurement. It maintains a constant ionic concentration and electrical potential against which the external sample's hydrogen ion activity is measured through the pH-sensitive glass membrane.
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Potassium chloride provides high ionic conductivity, minimizes liquid junction potentials, and ensures stable reference electrode performance with minimal temperature dependence.
Typically every 12-24 months or when electrode performance drifts, as evaporation or contamination can alter concentration and pH.
pH 7.00 is standard for symmetrical electrode design; some specialized electrodes use pH 4.01 or 9.21 buffers for specific measurement ranges.
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