Fig. 2. Effect of various single reagent-grade amendments (hydroxyapatite, illite, zeolite) on ⁸⁸Sr concentration (A) and pH (B) after equilibrating for 30 d in 0.001 mol L^-1 CaCl₂. Figure C is the subsequent 1.0 mol L^-1 NH₄Cl-extractable Sr after equilibration. Error bars indicate the standard deviation of the means.

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