It is shown that the fundamental potential determining ion system for Ca3(PO4)2 and CaCO3 particles is the Ca2+/anion pair rather than H+/OH–. In addition, the electrical capacity of the inner region of the electric double layer at the aqueous solution interface with both salts near their isoelectric points is ∼40 µF cm–2, with electrokinetic potentials equal to inner diffuse layer potentials.
T. Foxall, G. C. Peterson, H. M. Rendall and A. L. Smith, J. Chem. Soc., Faraday Trans. 1, 1979, 75, 1034 DOI: 10.1039/F19797501034
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