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Hydroxyl content of solution-precipitated calcium phosphates.

J L Meyer

    Calcified Tissue International
    |April 17, 1979
    PubMed
    Summary
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    This study introduces a new method to measure hydroxide ions in calcium phosphate precipitates. Hydroxide content increases with crystal maturity and pH, reaching significant levels after maturation.

    Area of Science:

    • Analytical Chemistry
    • Materials Science
    • Biomineralization

    Background:

    • Calcium phosphate precipitates are crucial in biological and industrial applications.
    • Accurate characterization of their composition, including hydroxide content, is essential.
    • Existing methods may be limited by impurities or complexity.

    Purpose of the Study:

    • To develop and validate a precise method for determining titratable hydroxide ion content in calcium phosphate precipitates.
    • To investigate the influence of crystal maturity and pH on hydroxide incorporation.
    • To compare results with established solution thermodynamic techniques.

    Main Methods:

    • A novel titration method was employed for hydroxide ion determination.
    • The method accounts for other titratable species within the crystal lattice.

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  • Analysis was performed on precipitates prepared under varying pH conditions and maturation times.

    • Main Results:

    • The developed method accurately quantifies hydroxide ions, unaffected by lattice constituents or impurities.
    • Hydroxide content in calcium phosphate precipitates correlates positively with crystal maturity and precipitation pH.
    • Amorphous and early crystalline phases exhibit negligible hydroxide content, which increases significantly after 3-4 days of maturation.

    Conclusions:

    • The new titration method provides a reliable means to assess hydroxide content in calcium phosphate precipitates.
    • Crystal maturity and pH are key factors controlling hydroxide incorporation during precipitation.
    • Understanding hydroxide content is vital for controlling the properties of calcium phosphate materials.