Arsenic fixation on iron-hydroxide-rich and plant litter-containing sediments in natural environments |
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| Authors: | Andreas Fritzsche Holger Dienemann Ernst Gert Dudel |
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| Institution: | 1. Lehrstuhl für Bodenkunde, Department für ?kologie, Wissenschaftszentrum Weihenstephan, Technische Universit?t München, 85350, Freising-Weihenstephan, Germany
2. Institut für Allgemeine ?kologie und Umweltschutz, Technische Universit?t Dresden, 01735, Tharandt, Germany
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| Abstract: | Iron-hydroxide-rich and plant litter-containing sediments from natural sites contaminated with uranium mine tailing leachates were examined for their ability to adsorb arsenic. The samples with high contents of iron hydroxides (Fetotal concentration, >300 g kg−1) exhibited remarkable fixation of arsenic (up to 40 g As kg−1). This value corresponded approximately to the supersaturation point for natural iron hydroxides under the present conditions, and it was significantly lower than the value found for synthetic iron hydroxides. There was a strong correlation (R=0.8999) between the concentration of iron and that of arsenic at low arsenic contents, indicating adsorption on strong binding sites. Although all the samples had noticeable contents of organic carbon (plant litter), calcium, and manganese, no obvious effect of these elements on arsenic fixation could be detected. The amount of iron hydroxides was found the only fixation-controlling parameter immediately below a leaching water source. |
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| Keywords: | Adsorption capacity Alkaline neutral waters Uranium tailings Ore mountains |
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