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Electrolyte Analysis

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Ion-selective electrodes (ISEs) are the most commonly employed methods of analysis for many electrolytes, including sodium and potassium, although spectroscopic and spectrophotometric methods also exist. Only free unbound ion is measured by the ISE. This limitation becomes significant when measuring such ions such as calcium and magnesium. ISEs consist of or are covered by a unique material that is more selective for one ion than other ions. When the ion comes in contact with the electrode, there is a change in the potential compared to the reference electrode, measured as a voltage change, due to the ionic activity.20 Test Methodology 6-6 describes the specific principles of ISEs.

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