IONIC ADSORPTION OF SAND - AND CLAYSTONES

F. Egerer, K. Namesánszki, F. Mádai

Аннотация


It is well-known that the contamination of soils or rocks, developing as a result of industrial, agricultural or some other activity, is a significant environmental problem. The task in these cases is to determine the kind and the amount of the contaminating element as well as to indicate its areal distribution. To complete these tasks, it is necessary know how the different soils and rocks do adsorb different ions, with a special regard to the toxic elements. We mention here only a few examples from the large amount of papers on this topic. Our own experimental results as well as the requirements for environmental mapping have proven the necessity and importance of these experiments. The importance of ionic adsorption is demonstrated by the fact that research on this topic have a high priority in the US. Experimental results on ionic adsorption of certain rocks are presented in this paper. Several actions were investigated in different anionic environments. It has to be mentioned that precipitation of minerals in a small amount takes also place parallel with the adsorption. However, since it was not possible to distinguish these processes, we consider later the phenomena as adsorption, whether precipitation occurs or not.



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Литература


>1. Baeyens, B. & Bradbury, M.H.:"A mechanistic description of Ni and Zn sorption on Na-montmorillonite. Part 1: Titration and sorption measurements" J. Contaminant Hydrology 27 (1997) pp. 223-248.

2. Bradbury, M.H. & Baeyens, B.:"A mechanistic description of Ni and Zn sorption on Na-montmorillonite. Part 2: Modelling" J. Contaminant Hydrology 27 (1997) pp. 223-248.

3. Bar-Tal, A. & Fick, M.I. & Feigenbaum, S. & Sparks, D.L. & Fischman, S.: "Determination of rate coefficients for potassium-calcium exchange on vermiculite using a stirred-flow chamber" Soil Science Society of America Journal, 59 (1995) pp. 760-765.

4. Grossl, P.R. & Sparks, D.L.: "Evaluation of contamination adsorption/desorption on goethite using pressure-jump relaxation kinetics." Geoderma, 67 (1995) pp. 87-101.

5. EPA R825397: "Trace metal dynamics in reducing aquatic sediments: Determination of adsorption and co-precipitation on undisturbed sediment core sections using a plug-trough reaction" [25/10/99]

6. EPA R825399: "Processes influencing the mobility of arsenic and chromium in reduced soil sediments." [25/10/99]

7. Bohn P. & Gyuricza Gy.: "Element of requirements of the geological environment protection maps." (in Hungarian) Foldtani Kutatas XXXIV (2), (1997) pp. 20-22.

8. University of Miskolc, Department of Mineralogy and Petrology: "Investigation on materials of refuse dumps in Borsod-Abauj-Zemplen and Veszprem counties." (in Hungarian, research report) Miskolc, 1992.

9. University of Miskolc, Department of Mineralogy and Petrology: "Investigation on environmental effects of refuse dumps in Borsod-Abauj-Zemplen, Veszprem and Nograd counties." (in Hungarian, research report) Miskolc, 1993.

10. Egerer F. & Kosik G. & Namesanszki K.: "Environmental geological problems of waste deposits." (in Hungarian) Contribution of the University of Miskolc, series A, 50 (1995) pp. 237-245.


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