The chemical processing of the samples was performed using the method described by Tacail et al. (9). Briefly, enamel samples were dissolved in 300 μl of suprapure 1 M HCl acid, of which 30 μl was saved for the determination of elemental concentrations, and the remaining 270 μl was processed through AG50X-W12 cation exchange resin in 1 M HCl medium to dispose sample matrix. Ca and Sr fractions were collected in 6 M HCl medium. Ca fractions were then separated from Sr by loading samples onto columns filled with Sr-specific resin (Eichrom Sr-Spec) in suprapure 3 M HNO3 medium. Blanks for the whole procedure did not exceed 100 ng of Ca (9).

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