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On impurities and the internal structure in precipitates occurring during the precipitation of nanocrystalline calcium phosphate

✍ Scribed by Z. Zyman; M. Epple; D. Rokhmistrov; V. Glushko

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
257 KB
Volume
40
Category
Article
ISSN
0933-5137

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✦ Synopsis

Abstract

Nanocrystalline calcium phosphate was precipitated at 20 °C from calcium nitrate and ammonium phosphate solutions at a pH of 9–11. The nature of the mass loss steps in thermogravimetry of the product was revealed by in‐situ mass spectrometry of released gases upon heating. Major amounts of nitrate‐containing impurities like NH~4~NO~3~ and Ca(NO~3~)~2~ were present which could only be removed by multiple washing with water. These impurities were not crystalline, but they were clearly detectable in the infrared spectrum. In conclusion, the high specific surface area of freshly precipitated calcium phosphate may cause the adsorption of considerable amounts of foreign compounds (molecules and ions) in the percent mass range.

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