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Soil Science Society of America Journal Abstract -

Zinc Adsorption Isotherms for Soil Clays with and Without Iron Oxides Removed1


This article in SSSAJ

  1. Vol. 40 No. 3, p. 349-352
    Received: Nov 19, 1975
    Accepted: Feb 17, 1976

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  1. L. M. Shuman2



The clay fraction from four predominant Georgia soils sampled at two depths was separated and the iron oxides removed from a portion of each clay sample. These clays were equilibrated with five Zn solutions to measure Zn adsorption. The data conformed to the Langmuir adsorption isotherm. Langmuir coefficients were used to evaluate the Zn adsorptive capacities of the clays and the bonding energies for Zn. Adsorptive capacities and CEC values for the clays from Decatur cl and Leefield ls soils were higher than those for clays from the Cecil sl and Norfolk ls soils. Differences in adsorptive capacities were not consistent between depths nor between samples with or without Fe oxides. However, removal of the Fe oxides increased the capacity to adsorb Zn in more instances than it decreased this capacity. Zinc adsorptive capacities were directly related to the CEC values for the clays. When comparing those samples with and without Fe oxides removed, bonding energies were inversely related to adsorptive capacities.

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