Specific sarption of low quantities of Zn in eight gleysolic C horizons in Quebec soils was studied in dilute Cacl2 solutions. Initial Zn concentrations were between 5 and 30 ppm. The range of specific Zn sorbed calculated as percentages of Zn added ware very high to moderately high indicating a high affinity sarption for Zn of the sorbed complex surface. Specific Zn sarption was found to agree with the Freundlich and Langmuir isotherms over a large range of concentrations. Amounts of specific Zn sorbed were very highly correlated with the pH of the equilibrium solutions. Clay content and soil pH were the dominant soil properties influencing the specific Zn sorption. Nevertheless, soil pH was the only variable which had contributed the most to the variation of maximum specific Zn sorption. Also, the ratio of clay content to CEC was significantly correlated with specific Zn sorption parameters and was attributed to the interaction of soil clay content with CEC. The values of Zn solubility calculated as pZn+ZpOH indicated that Zn was not precipitated as hydroxide under the experimental conditions, but was sorbed on exchange and specific sites. Possible sorption mechanisms of Zn are mentioned.
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Karam et al. (1983) studied this question.
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