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Titrimetric determination of phosphates and monofluorophosphates in tooth pastes

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Summary

Titrimetric methods for a fast determination of phosphates and monofluorophosphates in tooth pastes are described. They are based on the precipitation of PO 3−4 -ions (directly or after the hydrolysis of PO3F2−-ions) as BiPO4 in nitric acid (pH 0.1–0.5). The end-points are detected visually (back EDTA-titration of the non-bonded Bi3+-ions), or potentiometrically (direct titration of phosphates with bismuth by a specially prepared Bi/Bi2O3-electrode). The titrations are performed without separating the precipitate. An ultrasonic field is applied to accelerate the destruction of the dentifrices.

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Authors and Affiliations

  1. Department of Analytical Chemistry, Sofia University of Technology, Bulgaria

    Rahila Borissova & Abderrachman Debouki

  2. Department of Physical Chemistry, Sofia University of Technology, 8 Kliment Ohridski, BG-1156, Sofia, Bulgaria

    Tzanko Nikolov

Authors
  1. Rahila Borissova
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  2. Abderrachman Debouki
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  3. Tzanko Nikolov
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Borissova, R., Debouki, A. & Nikolov, T. Titrimetric determination of phosphates and monofluorophosphates in tooth pastes. Fresenius J Anal Chem 347, 63–66 (1993). https://doi.org/10.1007/BF00326046

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  • DOI: https://doi.org/10.1007/BF00326046

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