Observations on the apparent solubility of carbonate-apatites

被引:26
作者
Shellis, RP
Lee, AR
Wilson, RM
机构
[1] Sch Dent, MRC, Dent Grp, Bristol BS1 2LY, Avon, England
[2] Univ London Queen Mary & Westfield Coll, St Bartholomews & Royal London Coll Med & Dent, Dept Biophys Relat Dent, London E1 4NS, England
基金
英国医学研究理事会;
关键词
carbonate-apatites; solubility; crystallinity; scanning electron microscopy;
D O I
10.1006/jcis.1999.6407
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Previous reports indicating that the apparent solubilities of carbonate-apatites are low appear to conflict with findings that carbonate incorporation into the apatite structure tends to reduce stability. Carbonate-apatites were prepared by a precipitation method and by hydrolysis of monetite and brushite, Apparent solubility profiles were determined by measuring dissolution after exposure for 24 h to acetate buffers with known saturations with respect to hydroxyapatite, All preparations showed a range of apparent solubilities, in agreement with previous work. Precipitated samples had higher apparent solubilities than samples prepared by hydrolysis and this was correlated with differences in crystallinity, Further experiments showed that pyrophosphate ion reduced the apparent solubility, but it was concluded that pyrophosphate occurring naturally in synthetic apatites would be insufficient to cause low apparent solubilities. Microscopical observations showed that precipitated carbonate-apatites were composed of small crystals of uniform size, whereas carbonate-apatites prepared by hydrolysis consisted of both small crystals and very large crystals. The low apparent solubilities observed in the latter preparations are attributed to the large crystals. The surface phenomena possibly involved in apparent solubility behavior are discussed. (C) 1999 Academic Press.
引用
收藏
页码:351 / 358
页数:8
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