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Crystal Research and Technology |
Cryst. Res. Technol. 39,
235 (2004) - Abstract -
Effects of cadmium on crystallization of calcium phosphates
H. E. Lundager Madsen, F. Abbona*, and E. Barrese**
Chemistry Department, K.V.L., 40 Thorvaldsensvej, DK-1871 Frederiksberg C, Denmark
*Dipartimento di Scienze Mineralogiche e Petrologiche dell’Università, via Valperga Caluso 35, I-10125 Torino
**Dipartimento di Scienze della Terra, Università della Calabria, I-87036 Rende (CS)
| Keywords | cadmium phosphate, calcium phosphate, precipitation |
| PACS | 64.60.Qb, 81.10.Dn |
| DOI | 10.1002/crat.200310176 |
The precipitation of calcium phosphates in the presence of increasing cadmium amount was studied at 25°C in dilute ammoniacal solutions ([Ca] = [P] = 0.005 M). An amorphous precipitate, an apatite-like calcium phosphate and the compound Cd5H2(PO4)4.4H2O are found according to pH and Cd concentration. The nucleation of hydroxyapatite is greatly delayed by cadmium, which influences also its crystallinity, but the effect tends to vanish with time. The role of cadmium is discussed.
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