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Zinc adsorption was studied in suspensions of 10 calcareous Arizona soils in dilute ZnSO 4 solutions. At low concentrations, Zn 2+ adsorption was described by the Langmuir adsorption equation. The calculated Langmuir adsorption maxima were related to the carbonate and organic matter contents of the soils. When the added Zn 2+ exceeded the adsorption maximum, the value of the (Zn)(OH) 2 ion concentration product in solution corresponded to the solubility of zinc hydroxide or carbonate so long as soil carbonates were present. At lower amounts of adsorbed Zn 2+ and/or when the soil carbonates had dissolved, the (Zn)(OH) 2 product was about one hundred‐fold less indicating that the soils then retained Zn 2+ about as strongly as zinc silicate, and more strongly than zinc hydroxide or carbonate.
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Udo et al. (1970) studied this question.
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