A study of the anomalous behaviour of the glass electrode in solutions containing hydrofluoric acid

Emil Sørensen, T. Lundgaard

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    A defined surface hydration of the glass electrode is secured by pre-treatment with 0.1 N HF followed by rinsing with pure 0.1 N HCl for a few minutes. On subsequent contact with 0.1 N HCl containing HF, the electrode potential shows a change which is determined by the [HF]. The immediate reaction is an adsorption of HF by the glass surface. This is followed, at [HF] higher than 0.01 N, by the substitution of two F− for OH− per Si atom. With increasing HF the attack on the Si-O-Si bonds becomes severe, but it can be tolerated to a considerable degree because the newly formed surface is identical with the previous one. Some applications of the glass electrode in titrations with HF are suggested in an appendix.
    Original languageEnglish
    JournalJournal of Electroanalytical Chemistry
    Volume9
    Pages (from-to)128-133
    ISSN1572-6657
    DOIs
    Publication statusPublished - 1965

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