Which electrode is used for fluoride (F-) and chloride (Cl-) measurements?

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Multiple Choice

Which electrode is used for fluoride (F-) and chloride (Cl-) measurements?

Measuring fluoride and chloride with an electrode relies on a membrane that is highly selective for that specific ion. Solid-state crystal membranes, such as LaF3-based crystals for fluoride and corresponding chloride-selective crystals for chloride, provide the necessary selectivity and stable potentials needed for reliable halide measurements. The membrane establishes an interface whose potential shifts with the activity of the target ion, and this change is read out by the instrument following the Nernst equation. Glass membranes are mainly used for pH sensing, gas-sensing electrodes track gases, and a vancomycin-based liquid polymer is a specialized receptor system—not the standard approach for halide ions. Hence, the solid-state crystal membrane electrode is the best fit for fluoride and chloride measurements.

Measuring fluoride and chloride with an electrode relies on a membrane that is highly selective for that specific ion. Solid-state crystal membranes, such as LaF3-based crystals for fluoride and corresponding chloride-selective crystals for chloride, provide the necessary selectivity and stable potentials needed for reliable halide measurements. The membrane establishes an interface whose potential shifts with the activity of the target ion, and this change is read out by the instrument following the Nernst equation. Glass membranes are mainly used for pH sensing, gas-sensing electrodes track gases, and a vancomycin-based liquid polymer is a specialized receptor system—not the standard approach for halide ions. Hence, the solid-state crystal membrane electrode is the best fit for fluoride and chloride measurements.

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