Abstract
Uptake of Pb, Cu and Zn by thalli of Cladonia convoluta (Lam.) and Cladonia rangiformis (Hoffm.) from different concentrations of solutions of Pb(NO 3) 2, CuCl 2 and ZnCl 2 was studied. Zinc accumulation was higher in living than in dead thalli, but the opposite occurred for Pb and Cu. Further study with a solution containing all three metals revealed that at higher concentrations, uptake of Zn was very low compared with that for the single-metal solution. Long term exposure of Cladonia living thalli in double deionised water and also in a 10 −6 M ZnCl 2 solution resulted in leaching of Zn. Leaching of Zn from the thalli was also observed after uptake of Pb or Cu from a single-metal solution. No effects were observed on naturally accumulated Pb with uptake of Cu or Zn and on naturally accumulated Cu with uptake of Pb or Zn from a single-metal solution. It can be concluded that Pb, Cu and Zn ions were more strongly bound in C. convoluta than in C. rangiformis.
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