...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Crystal growth & design >Calcium Phosphate Solubility: The Need for Re-Evaluation
【24h】

Calcium Phosphate Solubility: The Need for Re-Evaluation

机译：磷酸钙的溶解度：需要重新评估

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The determination of the solubility of calcium phosphates by the conventional large excess of solid method has been demonstrated to be inappropriate. The problem lies in incongruent dissolution, leading to phase transformations, and lack of detailed solution equilibria: all calculations have been based on simplifications, which are only crudely approximate. The absolute solid-titration approach shows excellent reliability and reproducibility. Using solid titration, the true solubility isotherm of hydroxyapatite (HAp) has been found to lie substantially lower than previously reported. In addition, contrary to wide belief, dicalcium phosphate dihydrate (DCPD) is not the most stable phase below pH similar to 4.21 where calcium-deficient HAp is less soluble. The misunderstanding here arises from the metastability of DCPD, which nucleates much more easily than HAp at low pH. Such results indicate that the Ca-P system is in need of complete reappraisal. The solid-titration method can be extended to other complex systems.
机译：已经证明用常规的大量过量的固体方法测定磷酸钙的溶解度是不合适的。问题在于溶解度不一致，导致相变，并且缺乏详细的溶液平衡：所有计算都基于简化，而这仅仅是粗略的近似。绝对固体滴定法显示出极好的可靠性和可重复性。使用固体滴定法，发现羟基磷灰石（HAp）的真实溶解度等温线大大低于先前报道的水平。此外，与普遍的看法相反，磷酸氢钙二水合物（DCPD）在pH值低于4.21时不是最稳定的相，在此钙缺乏的HAp较难溶解。此处的误解是由于DCPD的亚稳性所致，它在低pH值下比HAp更容易成核。这样的结果表明，Ca-P系统需要完整的重新评估。固体滴定法可以扩展到其他复杂的系统。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号