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- W2187329724 abstract "Themobility of heavy metals in sediments and soils depends strongly on physical properties and chemical and mineralogical composition of such environments. Five types of samples with different amounts of carbonates, organic matter, chemical composition and various grain sizes were cho- sen. Experimental sorption data from batch tests were evaluated by Langmuir and Freundlich type isotherms, which provided main sorption characteris- tics of sediment samples for heavy metals (Cu, Cd). In order to simulate natural conditions more realistically, several leaching column tests were also per- formed. The sample sorption capacities under static and dynamic conditions were evaluated. All chosen samples bonded Cu more efficiently and firmly than Cd. Distilled water washed out about 6 % of Cu and 44 % of Cd from HBS 2 (quartz-dominated sample with 74 wt% of sand-sized fraction) and 6 % of Cu and 9%o f Cdfrom HBS 6 (finer-grained sample with some amount of organic matter and carbonates). Carbonates proved to be crucial for the mo- bility of heavy metals in natural samples. Free metals were washed out of pores at the very beginning of the desorption experiments. Then, weakly ad- sorbed metals (electric double layer) were washed out and finally, a low stationary metal concentration was established. Such behaviour should result in a slow release of small amounts of a heavy metal, which should therefore not represent significant danger to the environment." @default.
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- W2187329724 date "2003-01-01" @default.
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- W2187329724 title "Adsorption of copper and cadmium from aqueous solution by various types of sediments under static and dynamic conditions" @default.
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