Kratko priopćenje

Nucleation of Calcium Phosphate from Solutions at Physiological pH

H. Furedi-Milhofer ; Department of Physical Chemistry, Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia
B . Purgarić ; Department of Physical Chemistry, Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia
Lj. Brečević ; Department of Physical Chemistry, Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia
N. Pavković ; Department of Physical Chemistry, Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia
E. Oljica ; Department of Physical Chemistry, Institute »Ruder Boskovic«, Zagreb, Croatia, Yugoslavia

Sažetak

In a previous paper1 it was shown that when phase transition from aqueous solutions occurs at metastable equilibrium, the stoichiometry of the nucleating phase can be conveniently evaluated from the precipitation boundary2 • The method was applied to calcium phosphates nucleating in the pH range 6.3 , to 9.1 from solutions containing calcium chloride and sodium phosphate at constant
total phosphate concentration 1 X 10-3 M. The calcium phosphate ratio
of the nucleating phase was found to be 1.5 and the formation of an amorphous metastable precursor to hydroxyap atite was concluded. Because of its implications on biological calcification it was of interest to reexamine this result restricting the experiments to the physiological pH region (pH 7.25-7.5), but taking into account possible variations of total phosphate and total calcium concentrations. This was done as part of more extensive investigations of the precipitation of calcium phosphates from aqu eous solutions and from media containing 0.15 M sodium chlorid e.

Ključne riječi

Hrčak ID:

207972

URI

https://hrcak.srce.hr/207972

Datum izdavanja:

20.5.1969.

Posjeta: 358 *