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Accumulation and release of Pb(II) in aqueous solution by aquatic mosses (Fontinalis antipyretica)

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The uptake and release of Pb(II) by Fontinalis antipyretica was studied in laboratory, by exposing the plants to different lead concentrations for 144 h and 335 h contamination and decontamination periods, respectively. A first order kinetic model was fitted to the experimental data to determine the uptake and release constants, k
1
and k
2
, and other relevant parameters. The metal accumulation capacity, at equilibrium, follows the order: Pb(II) > Zn(II) > Cd(II) > Cr(VI). A Bioconcentration Factor (BCF) and a Biological Elimination Factor (BEF) were also determined; for 0.9–2.2 mg Pb l
−1
, BCF decreases from about 30748 to 21296.

Keywords: Fontinalis antipyretica, first–order models, kinetics, lead uptake, Pb(II), aqueous solutions, aquatic mosses, kinetic modelling

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