Fig. 6. Effect of calcium–phytate precipitate (Ca_n–IP6), dodeca sodium–phytate (Na₁₂–IP6), and hydroxyapatite (HA) on soluble Cr (A), As (B), and Se (C) after equilibration for 136 h in 0.001 M CaCl₂. Error bars represent the standard deviation of the treatment means.

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