The state and adsorption behaviour of traces of cadmium in aqueous solutions |
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| Affiliation: | 1. Institute of Earth Sciences, Science Institute, University of Iceland, Askja, Sturlugata 7, 101 Reykjavik, Iceland;2. Applied Geochemistry, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 971 87 Luleå, Sweden;3. Department of Earth Sciences, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA;1. Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan;2. Engineering and Technology Department, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan;1. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, USA;2. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, USA;3. Department of Geosciences, Pennsylvania State University, State College, USA;4. Institute of Earth Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel;1. Mineral Sciences Department, Smithsonian Institution, PO Box 37012 MRC 119, Washington, DC 20013, United States;2. Department of Earth and Environmental Geoscience, Washington and Lee University, 204 W. Washington Street, Lexington, VA 24450, United States;3. Department of Earth and Environmental Sciences, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455, United States |
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| Abstract: | ![]()
The state of trace cadmium in aqueous nitrate solutions has been analysed by dialysis, centrifugation and electromigration. It has been found that Cd2+ ions prevail in solutions of pH <5, whereas colloidal forms are present at higher pH, together with the ionic or molecular products of cadmium hydrolysis. The nature and abundance of the colloids depends on the concentration of cadmium. Mostly pseudocolloids are formed in ≤5 × 10−7 M solutions due to adsorption of Cd(OH)2 and CdOH+ on foreign colloidal impurities. At 5 × 10−6 M polymerisation of the hydrolytic products probably takes place with formation of colloidal cadmium hydroxide or basic salts. Adsorption of traces of cadmium has been studied on glass and plexiglass as a function of pH, age and composition of the solution and concentration of cadmium. Probable mechanisms of adsorption have been proposed. |
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