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RESULTS

The linear, Freundlich and Langmuir adsorption isotherms of each soil are illustrated in Figure 1. The sandy soil has the highest slope, loamy soil has an average slope and the clay soil slope has the lowest. This distinction in texture classes is more visible in the case of the linear model than in the case of the Freundlich model and even less in the case of Langmuir model. This indicates heterogeneity in the adsorption of solute according to the texture of each soil.