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Elimination of fluoride ions in water for human consumption using hydroxyapatite as an adsorbent

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Abstract

In this work, a synthetic hydroxyapatite, Bio-gel HTP, marketed by BIO-RAD®, has been studied in order to propose a method to remove the excess fluoride present in drinking water. The removal of fluoride ions by this adsorbent has been studied as a function of solution pH, and fluoride ion concentration. Experiments of fluoride ions sorption have been carried out with the use of 18F radiotracer in solutions of NaF at several concentrations with an ion selective electrode used for fluoride analysis. The adsorption isotherms show that the best fluoride adsorption on hydroxyapatite occurs at a pH range of 7.0–7.5. At this pH value the solid presents an important capacity of subtraction of fluoride, of around of 100 mmol/100 g.

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Authors and Affiliations

  1. Unidad Académica de Estudios Nucleares/Universidad Autónoma de Zacatecas, Ciprés No. 10, Frac. La Peñuela, Zacatecas, Zacatecas, México

    V. E. Badillo-Almaraz & J. Armando Flores

  2. Facultad de Química, Universidad National Autónoma de México, México, DF, México

    H. Arriola

  3. Facultad de Medicina, Universidad National Autónoma de México / PET-Ciclotrón, México, DF, México

    F. A. López & L. Ruiz-Ramirez

Authors
  1. V. E. Badillo-Almaraz
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  2. J. Armando Flores
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  3. H. Arriola
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  4. F. A. López
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  5. L. Ruiz-Ramirez
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Badillo-Almaraz, V.E., Armando Flores, J., Arriola, H. et al. Elimination of fluoride ions in water for human consumption using hydroxyapatite as an adsorbent. J Radioanal Nucl Chem 271, 741–744 (2007). https://doi.org/10.1007/s10967-007-0335-6

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  • DOI: https://doi.org/10.1007/s10967-007-0335-6

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