PMID: 36969Apr 17, 1979

Hydroxyl content of solution-precipitated calcium phosphates

Calcified Tissue International
J L Meyer

Abstract

A method is described for determination of the titratable hydroxide ion in calcium phosphate precipitates. The procedure requires accurate analysis of the other titratable species in the crystal lattice but is unaffected by the presence of other lattice constituents or impurities. The method was applied to precipitates that had been previously analyzed by solution thermodynamic techniques, and the results were consistent with the earlier observations. The hydroxide content of the precipitates increased with crystal maturity and with increasing pH of the precipitation medium. The hydroxide content of the amorphous phase and the immediate postamorphous-crystalline transformation phase was shown to be nearly zero. After 3 to 4 days' maturation, the hydroxide content of precipitates prepared at pH values of 7, 8, and 9 was shown to increase to approximately 23, 40, 56% of that required for pure hydroxyapatite.

References

Jan 1, 1981·Calcified Tissue International·N C BlumenthalA S POSNER
Feb 1, 1993·Journal of Dental Research·K Ishikawa, E D Eanes

Citations

Oct 20, 1977·Calcified Tissue Research·E D Eanes, J L Meyer
Feb 28, 1978·Calcified Tissue Research·J L Meyer, E D Eanes
Jun 1, 1973·Clinical Orthopaedics and Related Research·J C Elliott
Jan 1, 1972·Calcified Tissue Research·J D Termine, E D Eanes
Jan 1, 1973·Calcified Tissue Research·J D Termine, D R Lundy
Oct 23, 1973·Calcified Tissue Research·N C Blumenthal, A S POSNER
Jan 1, 1972·Calcified Tissue Research·D J Greenfield, E D Eanes
Jan 1, 1971·Calcified Tissue Research·R M Biltz, E D Pellegrino
Jan 1, 1970·Calcified Tissue Research·G T VatasseryL Singer
Jan 1, 1968·The Journal of Physical Chemistry·A ChughtaiG H Nancollas
Oct 1, 1954·Biochimica Et Biophysica Acta·A S POSNERM J DALLEMAGNE
May 1, 1965·Archives of Biochemistry and Biophysics·A HIRSCHMAN, A E SOBEL

Related Concepts

Thermodynamics
Hydroxides
Calcium Phosphates
Solutions
Hydrogen-Ion Concentration
Mathematics

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