Interdependence of Anion and Cation Exchanges in Calcium Hydroxyapatite: Pb and Cl |
| |
| Authors: | S Sugiyama N Fukuda H Matsumoto H Hayashi N Shigemoto Y Hiraga J B Moffat |
| |
| Institution: | a Department of Chemical Science and Technology, Faculty of Engineering, The University of Tokushima, Minamijosanjima, Tokushima, 770-8506, Japan;b Shikoku Research Institute Inc. Yashima-Nishi, Takamatsu, 761-0192, Japan;c Guelph-Waterloo Centre for Graduate Work in Chemistry and Biochemistry, Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1 |
| |
| Abstract: | The ion exchange of Pb2+ and Cl− into calcium hydroxyapatite from aqueous solutions is studied at 293 K. Although the exchange of Cl− into CaHAp and PbHAp was not observed, in the presence of both Pb2+ and Cl− in aqueous solution the exchange of both Pb2+ and Cl− into CaHAp occurred, and, at least at intermediate concentrations of HCl, a proportionality between the sorbed quantities of these two ions was observed. The dissolution of CaHAp is shown to be dependent upon the pH, while the quantity of Pb2+ exchanged into the solid is not a function of the proton content; consequently, the exchange is not primarily a dissolution–precipitation process. |
| |
| Keywords: | calcium hydroxyapatite Pb2+ and Cl− exchange |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
