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• W213223888 abstract "In a column experiment on pyrite decomposition in the vadose zone of overburden material of an open cast lignite mine the release and the leaching characteristics of As, Cd, Ni and Pb were examined. In the experiment, the formation of acid mine drainage results in seepage water pH between pH 1.6 and pH 2.4 and EH values between 575 mV and 880 mV. Seepage waters with concentrations of up to 5500 μg/l As, 420 μg/l Cd, 47000 μg/l Ni and 1000 μg/l Pb are found. 100% of the arsenic is released during pyrite decomposition. Arsenic is not completely leached from the column, but about 70% remain sorbed to the solid phase. Under the experimental redox conditions the sorption of arsenic becomes smaller with decreasing pH. At the beginning of the experiment lead is leached from easily soluble phases. Despite the extreme geochemical conditions only 5% of the initial lead was mobilized, while 95% of the lead still remain in the system at the end of the experiment. Ni is released to 78% from easily soluble phases or by desorption. The remaining 22% originate from the dissolution of pyrite. Nickel shows a high mobility under the experimental pH-EH conditions. 75% of the total nickel is leached from the column. The mobility of cadmium is even larger. Only 5% remain in the material. 6% of the released cadmium originates from pyrite weathering, while 94% are released from easily soluble phases and by desorption processes. The species distributions of the elements are mainly determined by the high sulfate concentrations and the low pH." @default.
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• W213223888 date "2003-01-01" @default.
• W213223888 modified "2023-09-24" @default.
• W213223888 title "Pyrite weathering in the unsaturated zone of lignite mine tailings: release of As, Cd, Ni and Pb in a soil column experiment." @default.
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