Metallsorption an Illit und Metallfreisetzung unter Einwirken der Aminosäuren Glycin und Histidin |
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Authors: | Alfred Chodura Klaus Fischer |
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Affiliation: | 1. Institut für ?kologische Chemie, GSF- Forschungszentrum für Umwelt und Gesundheit, Ingolst?dter Landstra?e 1, D-85758, Oberschlei?heim 2. TU Munchen, Lehrstuhl für ?kologische Chemie, D-85350, Freising-Weihenstephan
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Abstract: | The heavy metal ions Zn(II), Pb(II), Cr(III) and Hg(II) were examined in regard of their adsorption behaviour towards Kaolin W from Lohrheim (51% illite, 31% kaolinite and 18% quarz). By means of the Langmuir and Freundlich models the determined adsorption isothermes could be linearized. The ability of glycine and histidine solutions to release heavy metal ions, pre-adsorbed on Kaolin W (36,1–2300 mg kg?1 Zn, Pb, Cr and Hg), was specified. It was found a low influence of glycine, but an evident influence of histidine to the metal release, expecially of Pb and Cr, depending on the metalcoating, metal-amino acid-ratio, experimental pH and testing period. The highest remobilisation fraction, up to 98%, could be found in the case of Zn. This elucidates an enhancement of the zinc release compared with the blank solution, without containing amino acids, to a factor of maximal 9,3. As far as Pb and Cr were concerned the histidine extraction exeeded the remobilisation in the blank solution by a maximum of 50,8 or 40. As Hg develops strong covalent bondings to illite by OH-bridges, the release of Hg was not affected by the amino acids. |
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