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1970•Soil Science Society of America JournalRequires access

Zinc Adsorption by Calcareous Soils

E. J. Udo, Hinrich L. Bohn, T. C. Tucker

Open publisher page 119 citations

Abstract

Abstract 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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Abstract 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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Available abstract

Abstract 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.

Key concepts: Adsorption, Zinc hydroxide, Zinc, Chemistry, Carbonate, Hydroxide, Soil water, Calcareous

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