Physico-chemical aspects of calcium vanadate apatite

By appropriate modifications of existing precipitation methods, a sample of calcium vanadate apatite, Ca sub(10)(VO sub(4)) sub(6)(OH) sub(2) was prepared at 110 degree C. It was characterized through X-ray, electron microscopic, infrared and thermoanalytical analyses in addition to chemical analysi...

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Bibliographic Details
Published in:Journal of materials science 1986, Vol.21 (1), p.161-164
Main Authors: GUPTA, S. K, RAO, P. V. R, NARASARAJU, T. S. B
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Inorganic chemistry and origins of life
Preparations and properties
Salts
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Summary:By appropriate modifications of existing precipitation methods, a sample of calcium vanadate apatite, Ca sub(10)(VO sub(4)) sub(6)(OH) sub(2) was prepared at 110 degree C. It was characterized through X-ray, electron microscopic, infrared and thermoanalytical analyses in addition to chemical analysis. Equilibrating the sample in buffered aqueous media at 37 degree C, the solubility was measured using micro-analytical techniques of Ca super(2+) and VO super(3)@)d4 super(-) present in the saturated solutions after separating the colloidal component of the solute. Duration of equilibration for the attainment of saturation of the solution of the sample was obtained from a study on its dissolution kinetics. The pK sub(ip) of calcium vanadate apatite was found to be 107.09. The investigation showed that pK sub(ip) was independent of the presence of the common ions.
ISSN:0022-2461
1573-4803
DOI:10.1007/BF01144715