Spectroscopic investigation of arsenate and selenate incorporation into hydroxylapatite

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Abstract

The mechanism(s) of arsenate and selenate incorporation into hydroxylapatite (HAP) using extended X-ray absorption fine structure (EXAFS) spectroscopy was investigated for As- and Se-doped HAP samples with concentrations between 200 and 2500 ppm. EXAFS data on As and Se K-edges have shown similar local coordination environments and are similar to that of P in HAP, suggesting the substitution of arsenate or selenate tetrahedra on the phosphate sites. EXAFS best-fitting for As-doped samples shows that the first shell is fitted with approximately 4 O atoms at ∼1.68 Å, showing As(V) in tetrahedral coordination, and Se K-edge EXAFS data are characterized by the backscattering contributions an oxygen shell at ∼1.2 Å in the Fourier transform, which can be fit with ∼4 O atoms at ∼1.65 ± 0.01 Å. This is characteristic of Se-O distances in SeO4 tetrahedron. These findings suggest that arsenate and selenate substitute for phosphate groups with local distortions during the incorporation of these metals into the structure of HAP.

Original languageEnglish
Pages (from-to)158-163
Number of pages6
JournalCurrent Applied Physics
Volume10
Issue number1
DOIs
Publication statusPublished - 2010 Jan

Keywords

  • Arsenate
  • Extended X-ray absorption fine structure spectroscopy
  • Hydroxylapatite
  • Incorporation
  • Selenate

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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