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Kinetics of Isotope Exchange on Hydroxyapatite¹

ABSTRACT

The kinetics of exchange of ³²P and ⁴⁵Ca in aqueous solution with synthetic, stoichiometric hydroxyapatitie was followed up to 200 hours. Seventy percent of the total exchange occurred in 1 hour, and isotopic equilibrium was reached at approximately 40 hours. Using McKay (13) plots, the exchange reaction was shown to be heterogeneous. Diffusion of isotope through solution "compartments" was considered to be rapid in relation to exchange occurring at the solid surface. The nature of the exchange curve was explained by the differing energies of activation of exchange for surface atoms located at different positions on the crystal landscape. The use of well-crystallized, stoichiometric hydroxyapatite resulted in the establishment of a well-defined isotopic equilibrium (11) with little evidence of loss of isotope through intracrystalline diffusion or recrystallization.

¹ Contribution from the Dep. of Soil Science and Plant Nutrition, Institute of Agriculture, University of Western Australia, Nedlands, W.A. One of the contributors wishes to acknowledge his support as a Queen Elizabeth II Fellow during this research project. The work reported forms part of a research program supported by the Australian Research Grants Committee.

² Formerly Graduate Student, Dep. of Soil Science; formerly Queen Elizabeth II Research Fellow, now Lecturer in Soil Science, University of Queensland, St. Lucia; Associate Professor and Professor of Soil Science, Dep. of Soil Science and Plant Nutrition, University of W.A., respectively.

Received for publication September 25, 1972. Accepted for publication January 26, 1973.

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