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Microdetermination of the fluoride ion using an amplification reaction

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Summary

A new simple, rapid and accurate amplification micro method for fluoride determination is described. It is based on the reaction between the sparingly soluble calcium iodate and the fluoride ion. After adding isopropyl alcohol to the solution, so that its final concentration is 65%, and filtering, an equivalent amount of the iodate is obtained. The latter is titrated iodometrically resulting in a six-fold amplification of the titre. The method is reproducible over a range from 0.4–8 mg fluoride ion. The mean recovery is 99.69%, after applying a correction factor due to potassium iodate solubility.

Zusammenfassung

Ein Multiplikationsverfahren zur Mikrobestimmung von Fluorid wurde beschrieben. Es beruht auf der Umsetzung zwischen dem schlecht löslichen Calciumjodat und Fluorid. Nach Zusatz von i-Propylalkohol, bis die Lösung 65% davon enthält, wird filtriert. Die äquivalente Jodatmenge wird jodometrisch titriert. Zwischen 0,4 und 8 mg Fluorid sind die Ergebnisse reproduzierbar. Bei Anwendung eines Korrekturfaktors wegen der Löslichkeit von Kaliumjodat wurden 99,69% Fluorid wieder gefunden.

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Authors and Affiliations

  1. Research Microanalytical Labs., Chemistry Department, Faculty of Science, A'in Shams University, Cairo, UAR

    W. I. Awad, S. S. M. Hassan & M. B. Elsayes

Authors
  1. W. I. Awad
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  2. S. S. M. Hassan
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  3. M. B. Elsayes
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Awad, W.I., Hassan, S.S.M. & Elsayes, M.B. Microdetermination of the fluoride ion using an amplification reaction. Mikrochim Acta 57, 688–693 (1969). https://doi.org/10.1007/BF01216297

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  • DOI: https://doi.org/10.1007/BF01216297

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