EFFECTS OF FLUORIDE ON THE HYDROLYSIS OF CALCITE IN POTASSIUM DIHYDROGEN PHOSPHATE SOLUTION

• 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 0.1M KH₂PO₄ solution containing potassium fluoride (0 and 1005 ppm as F) at 37°C by means of solution analyses (pH, Ca, P and F concentrations), X-ray diffraction, ³¹P magic angle spinning nuclear magnetic spectroscopy (MAS NMR), Fourier-transformed infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). With the non-fluoride solution, octacalcium phosphate (OCP) was a main product of the hydrolysis for 10 days though some amount of calcite still remained. With increasing in fluoride concentration in the solution, OCP formed less and apatite phase formed instead. Remaining calcite was also decreased with fluoride concentration. Fluoride in the solution was completely absorbed in the product after hydrolysis for 10 days except for the highest fluoride concentration of 1000 ppm. FT-IR analysis showed that the apatite phase formed was fluoridated B-type carbonated apatite, in which CO₃^2- ion substituted for PO₄^3- ion. Fluoride ion was found to promote fluoridated carbonated apatite formation directly and/or through OCP transformation.

収録刊行物

• Phosphorus Research Bulletin

  Phosphorus Research Bulletin 17 (0), 153-158, 2004

  Japanese Association of Inorganic Phosphorus Chemistry

キーワード

• Calcite
• Hydrolysis
• Fluoride
• Phosphate
• Carbonated apatite

詳細情報

• CRID: 1390282680440438528
• NII論文ID: 130004992468
• DOI: 10.3363/prb1992.17.0_153
• COI: 1:CAS:528:DC%2BD28XotlKkt74%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