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KIII-edge XANES spectra of Sr for abiotic Sr-CaCO3 precipitates (a), BCM of 2 mM Sr for 5 days (b), BCM of 1 mM Sr for 10 days (c), BCM of 1 mM Sr for 5 days (d), SrCl2, and SrCO3. Solid lines and dashed lines show experimental data and a linear combination fitting, respectively.
