HYDROLYSIS OF CALCITE IN POTASSIUM PHOSPHATE SOLUTIONS

• Matsuya Shigeki

  Department of Biomaterials, Faculty of Dental Science, Kyushu University

• Udoh Koh-ichi

  Department of Biomaterials, Faculty of Dental Science, Kyushu University

• Nakagawa Masaharu

  Department of Biomaterials, Faculty of Dental Science, Kyushu University

• Ishikawa Kunio

  Department of Biomaterials, Faculty of Dental Science, Kyushu University

抄録

Hydrolysis of calcite was investigated in 0.1 mol/L KH₂PO₄/KB₂PO₄ solutions with various pHs between 4.5 and 8.5 at 60°C by means of solution analyses (pH, Ca and P concentrations), X-ray diffraction, Fourier-transformed infrared spectroscopy and scanning electron microscopy. Calcite was mostly hydrolyzed within several days and the final product was octacalcium phosphate (OCP) or apatite phase depending on their initial pHs. OCP was initially formed in the solution with lower pH and it was transformed into apatite phase with increasing in pH. Calcite was directly transformed into apatite in 0.1 mol/L K₂HPO₄ solution with the highest initial pH. These phenomena were probably related to solubility of apatite, OCP and calcite at pH during hydrolysis. FT-IR analysis showed that the apatite phase formed was B-type carbonated apatite, in which CO₃^2- ion substituted for PO₄^3- ion.

収録刊行物

• Phosphorus Research Bulletin

  Phosphorus Research Bulletin 17 (0), 159-164, 2004

  Japanese Association of Inorganic Phosphorus Chemistry

キーワード

• Calcite
• Hydrolysis
• Phosphate
• Carbonated apatite

詳細情報

• CRID: 1390282680440439936
• NII論文ID: 130004992469
• DOI: 10.3363/prb1992.17.0_159
• COI: 1:CAS:528:DC%2BD28XotlKkt7w%3D
• ISSN: 09184783
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可