Abstract
Various soil zones such as Bw, C1, and C3 are developed on spilite. Montmorillonite, vermiculite and chlorite is moderately occurred in the C1 and C3 soil zones, in contrast montmorillonite and vermiculite are absent in Bw soils whereas illite and sesquioxide are relatively increased. The high cation exchange capacity (CEC) of montmorillonite and vermiculte and moderate CEC of chlorite and illite resulted in the high adsorption of heavy metals. The adsorption of the heavy metals on spilite soil zones was studied at different concentrations and pH levels. Heavy metals like lead, cadmium, and copper were selected for adsorption studies considering their contribution as toxic metals in the environment. The initial solute concentrations ranged from 7.0 × 10−3 to 1.0 × 102 mg/L. The sorption behavior of Cd2+, Pb2+, and Cu2+ on soil zones of spilite was investigated using the batch equilibrium technique at 25°C. The characteristics of the adsorption process were investigated using Scatchard plot analysis (q/C vs. q) by the batch equilibrium technique at 25°C. In the adsorption of heavy metals, deviation from linearity in the plot of q/C versus q was observed, indicating the presence of multi-model interaction and non-Langmuirean behavior. When the Scatchard plot showed a deviation from linearity, greater emphasis was placed on the analysis of the adsorption data in terms of the Freundlich model, in order to construct the adsorption isotherms of the metal(s) at particular concentration(s) in solutions. The adsorption behavior of these metal ions on spilite soil zones is expressed by the Freundlich isotherms. Adsorption constants and correlation coefficients for the Cd, Pb, and Cu on spilite soil zones were calculated from Freundlich plots.
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Acknowledgments
I am greatly indebted to anonymous reviewers for their critical reviews and suggestions, which resulted improvement of the manuscript. I am also extremely grateful to Prof. Dr. J. Schwarzbauer and Prof. Dr. G. Dörhöfer for their editorial comments and suggestions. I thank Dr. A. Ayar from the Niğde University, Assoc. Prof. Dr. S. Kadir from the Eskişehir Osmangazi University and Dr. E. Çiftçi from the Niğde University for their help in preparing the manuscript. In addition, I thank Prof. Dr. R. Mayer and Mrs. B. Köhne from the Kassel University for their help during this investigation.
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Gürel, A. Adsorption characteristics of heavy metals in soil zones developed on spilite. Environ Geol 51, 333–340 (2006). https://doi.org/10.1007/s00254-006-0329-7
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DOI: https://doi.org/10.1007/s00254-006-0329-7