CHED 1237 |
| Apatites, a diverse family of minerals, are found in the environment and in bones and teeth. They have the stoichiometry M10(PO4)6Z2, where M is a divalent cation and Z is a halide, hydroxide, or carbonate. The complexity of the apatite structure renders it vulnerable to ionic substitutions, which significantly alter physical and chemical properties. Calcium and lead apatites of various carbonate contents were prepared in aqueous media and identified by X-ray diffraction. Carbonate percentages were determined by combustion analysis. Solubility and M and P percentages were determined with ICP-AES. The lattice parameters were determined using X-ray diffraction and the atomic order was determined with microprobe Raman Spectroscopy. Ion products were calculated with Visual MINTEQ equilibrium software. Thermodynamic calculations predict that the solubilities of calcium and lead apatites increase with increasing carbonate incorporation. |
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Undergraduate Research Poster Session: Inorganic Chemistry
2:00 PM-4:00 PM, Monday, April 7, 2008 Morial Convention Center -- Hall A, Poster
Division of Chemical Education |