On-line Pervaporation Separation Process for the Potentiometric Determination of Fluoride in Dirty Samples

  1. Papaefstathiou, I. 1
  2. Tena, M.T. 1
  3. de Castro, M.D.L. 1
  1. 1 Universidad de Córdoba
    info

    Universidad de Córdoba

    Córdoba, España

    ROR https://ror.org/05yc77b46

Revue:
Analytica Chimica Acta

ISSN: 0003-2670

Année de publication: 1995

Volumen: 308

Número: 1-3

Pages: 246-252

Type: Article

DOI: 10.1016/0003-2670(94)00602-I SCOPUS: 2-s2.0-0029069418 GOOGLE SCHOLAR

D'autres publications dans: Analytica Chimica Acta

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Résumé

A selective method for the determination of fluoride in contaminated samples based on pervaporation of a volatile derivative and potentiometric monitoring of the anion after collection in a basic solution has been developed. Fluoride was converted to volatile trimethylfluorosilane by reaction with hexamethyldisilazane, and absorbed in dilute NaOH solution. Both the continuous and stopped-flow modes were used in order to accomplish a variable efficiency of the separation process thus enlarging the determination range which was established between 5 and 100 mg l -1, the precision ranging between 2.60 and 3.58%. The determination of the analyte in samples from different sources (i.e., tap water, well water, fertilizers and ceramic industry wastewater) testifies to its usefulness.