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Zinc Adsorption by Calcareous Soils¹

ABSTRACT

Zinc adsorption was studied in suspensions of 10 calcareous Arizona soils in dilute ZnSO₄ solutions. At low concentrations, Zn²⁺ 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 Zn²⁺ 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 Zn²⁺ 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 Zn²⁺ about as strongly as zinc silicate, and more strongly than zinc hydroxide or carbonate.

¹ Contribution of the Department of Agricultural Chemistry and Soils, University of Arizona, Tucson 85721. Taken from part of a dissertation submitted by E. J. Udo to the Graduate College. Presented before Div. S-2, Soil Science Society of America, New Orleans, La., Nov. 14, 1968.

² Graduate Student, presently Post-doctoral Research Fellow, Department of Agronomy, University of Ibadan, Nigeria; Associate Professor; and Professor, respectively.

Received for publication May 5, 1969. Accepted for publication January 27, 1970.