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Which of the following causes main interference in Fluoride electrode?

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in Analytical Instrumentation by (131k points)
Which of the following causes main interference in Fluoride electrode?

(a) H^+ ions

(b) OH^– ions

(c) Li^+ ions

(d) Cl^– ions

This question was posed to me in unit test.

The doubt is from Ammonia and Fluoride Electrode in chapter pH Meters and Ion Analysers of Analytical Instrumentation

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Correct answer is (b) OH^– ions

To explain: The main interference in fluoride ions is caused by OH^– ions. It has excellent selectivity.

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