 Hydroxyapatite Standard Reference Material 2910b Certificate of Analysis by NIST

NIST certificate issued 22 October 2026. Page 1 gives the stoichiometric formula and describes calcium/phosphorus measurements by X-ray fluorescence and ICP-OES. Page 2 gives certified elemental mass fractions and Ca/P ratio. Appendix A, Tables A1–A2, supplies powder-diffraction positions and lattice parameters as values of potential interest, explicitly not certified values. Page 5 describes Cu K-alpha diffraction with a rotating-anode source and scintillation detector.