Introduction In flue gas desulfurization systems that use magnesium hydroxide (Mg(OH) 2 ) slurry, the consumption of the desulfurization agent (Mg(OH) 2 ) is controlled using online pH analyzers. A great concern in the pH measurement is heavy staining of the pH electrodes by the Mg(OH) 2 slurry. To ensure accurate measurement, frequent cleaning of the electrodes with an acid is required, adding to both maintenance workload and cost. The E

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