Elsevier

Analytica Chimica Acta

Volume 111, 1 December 1979, Pages 71-77
Analytica Chimica Acta

Potentiometric titrations of selenium with a fluoride-selective electrode

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Abstract

Selenite can be determined with a fluoride-selective electrode by two methods: a direct procedure based on the joint titration of selenite and standard fluoride with lanthanum and an indirect method based on precipitation of selenite with excess of lanthanum followed by back-titration with fluoride. In the first case the end-point is located by the second derivative method, and in the second case by means of a Gran plot. Direct titrations are suitable for selenite concentrations above 5 mM; indirect titrations are useful for concentrations as low as 0.5 mM.

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