SSSAJ -- Sutter et al. 69 (2): 362 Figure IG4

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Fig. 4. Infrared spectra of pure-, Fe12-, Mn11-, and Cu12-synthetic hydroxyapatite (SHA) materials exposed to deionized water and 0.1 mM citric acid. Arrows indicate the vibrational modes of calcium citrate that occurred between 1573 and 1579 cm^–1.