Abstract
The competitive desorption/dissolution of kaolin-adsorbed heavy metal mixtures and mixtures of adsorbed Cd with Mg and/or Ca by four chelators (NTA, EDTA, EGTA, and DCyTA) was investigated. Metals were adsorbed on kaolin at pH 7 and the effects of chelator type and concentration on the extent of metal dissolution was studied at a solution pH of 10. EGTA addition. EGTA was the most effective chelator in selectively removing Cd from kaolin in the presence of adsorbed alkaline-earth metals. Approximately 90% of the adsorbed Ca and Mg were retained on the kaolin until almost all (> 80%) of the cadmium was dissolved by EGTA chelator. NTA was the least effective chelator in selectively dissolving Cd from kaolin contaminated with both Cd and Ca (≈ 45% of the adsorbed Cd could not be removed). All four chelators exhibited some desorption/dissolution selectivity for Cd, Cu, and Pb adsorbed on kaolin. When the concentration of chelator in solution was insufficient to dissolve all adsorbed metals, the observed metal ordering for chelation and dissolution was Cd > Cu > Pb (for EGTA), Cd > Pb > Cu (for EDTA and DCyTA), and Cu > Cd > Pb (for NTA).
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Acar, Y. B., Gale, R. J., Putnum, G. A., Hamed, J. and Wong, R.: 1990, Electrochemical processing of soils: theory of pH gradient development by diffusion and linear convection.J. Environ. Sci. Health 25(6), 687–714.
Alder, A. C., Siegrist, H., Gujer, W. and Giger, W.: 1990,Water Res. 24(6), 733–742.
Anderson, M. L. and Rubin, A. J.: 1980,Adsorption of Inorganics of Solid-Liquid Interface. Ann Arbor Science, Ann Arbor, MI.
Assink, J. W.: 1986, ‘Extractive Methods for Soil Decontamination: A General Survey and Review of Operational Treatment Installations’, in Assink, J. K. and van den Brink, W. J. (eds.),Contaminated Soil. Martinus Nijhoff, Dordrecht, Holland, pp. 655–667.
Brown, G. A. and Elliot, H. A.: 1992,Water, Air, and Soil Pollut. 62, 157–165.
Brown, M. J. and Lester, J. N.: 1979,Water Res. 13, 817–837.
Chubin, R. G. and Street, J.: 1981,J. Environ. Qual. 10(2), 225–228.
Dean, J. A., 1992. Lange's Handbook of Chemistry. 14th ed., McGraw-Hill Book Company, N.Y.
Elliott, H. A. and Brown, G. A.: 1989, Comparative evaluation of NTA and EDTA for extractive decontamination of Pb-polluted soils.Water. Air and Soil Pollt. 45, 361–369.
Garnett, K., Kirk, P. W. W., Lester, J. N. and Perry, R.: 1985, The Effect of Nitrilotraicetic Acid on the Solubilities of Metals in Soil-sludge Mixtures. J. Environ. Qual.14(4), 549–553.
Garnett, K., Kirk, P. W. W., Perry, R. and Lester, T. N.:1986, Nitrilotriacetic Acid in Sludge-amended Soil: Mobility and Effects on Metal Solubility.Environ. Pollut. (series B)12, 145–162.
Hamed, J., Acar, Y. B., Gale, R. J.: 1991, Pb(II) Removal from Kaolinite by Electrokinetics.J. Geotech. Engineer. 117(2), 241–271.
Hong, J. and Pintauro, P. N.: 1995, Desorption-complexation-dissolution Characteristics of Adsobred Cadmium from Soil by Chelators.Water, Air and Soil Pollut. 86,(1–4), 35–50.
Jackson, M. L.: 1964, Chemical Composition of Soils, in Bear, F. E. (ed.),Chemistry of the Soil, 2nd Edt., Reinhold Publishing Corporation, N.Y., pp. 71–141.
Kinniburgh, D. G., Jackson, M. L.: 1980, Cation Adsorption by Hydrous Metal Oxides and Clay, in Anderson, M. A. and Rubin, A. J. (eds.),Adsorption of Inorganics of Solid-Liquid Interface, Ann Arbor Science, Ann Arbor, MI.
Kobayashi, J., Morli, F. and Muramoto, S.: 1974,Trace Subst. Environ. Health 8, 179–192.
Lageman, R., Pool, W. and Seffinga, G.: 1989, Electro-reclamation: Theory and Practice,Chemistry and Industry, (18 Sept.), 585–590.
Lester, J. N., Harrison, R. M. and Perry, R.: 1979, The Balance of Heavy Metals Through a Sewage Treatment Work. I. Lead, Cadmium and Copper,Sci. Total Environ. 12, 12–23.
Linn, J. H. and Elliott, H. A.: 1982, Mobilization of Cu and Zn in Contaminated Soil by Nitrilotriacetic Acid,Water, Air and Soil Pollut. 37, 449–459.
Lo and Chen: 1990,Sci. Total Environ. 90, 99–116.
Meites, L.: 1963,Handbook of Analytical Chemistry. McGraw-Hill Book Company, New York. 1–45
Rossin, A. C., Perry, R. and Lester, J. N.: 1982,Environ. Pollut. (Ser. A.),29, 271–302.
Runnells, D. D. and Larson, J. L.: 1986, A Laboratory Study of Electromigration as a Possible Field Technique for the Removal of Contaminants from Ground Water,Ground Water Monitoring and Review, Summer 1986, 81–91.
Sanning, G. E. and Lewis, N. M.: 1990,J. Air Waste Manage Assoc. 40(12), 1706–1716.
Schauer, C. K. and Anderson, O. P.: 1987,J. Am. Chem. Soc. 198, 3646–3656.
Shapiro, A. P., Renauld, P. and Probstein, R.: 1989, Preliminary Studies on the Removal of Chemical Species from Saturated Porous Media by Electro-Osmosis,Physicochemical Hydrodynamics 11(5/6), 785–802.
Shindler, P. W. and Stumm, W.: 1987, ‘The Surface Chemistry of Oxides, Hydroxides, and Oxide Minerals’, in Stumm, W. (ed.)Aquatic Surface Chemistry John Wiley & Sons, New York, Chapter 4, pp. 83–110.
Stoveland, S., Lester, J. N. and Perry, R.: 1979,Water Res. 13, 949–965.
Vuceta, J. and Morgan, J.: 1978,Environ. Sci. Technol. 12(12), 1302–1309.
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Hong, J., Pintauro, P.N. Selective removal of heavy metals from contaminated kaolin by chelators. Water Air Soil Pollut 87, 73–91 (1996). https://doi.org/10.1007/BF00696830
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DOI: https://doi.org/10.1007/BF00696830