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Desorption of metals K, Al, Ca, Mg, Fe, Ba, Zn, Mn, Cu and Sr from Cetraria   islandica (L.) with solutions whose composition was similar to that of acid   rain, was investigated. Desorption of metals from the lichen was performed by   five successive desorption processes. Solution mixtures containing H2SO4,   HNO3 and H2SO4-HNO3 were used for desorption. Each solution had three   different pH values: 4.61, 5.15 and 5.75, so that the desorptions were   performed with nine different solutions successively five times, always using   the same solution volume. The investigated metals can be divided into two   groups. One group was comprised of K, Ca and Mg, which were desorbed in each   of the five desorption processes at all pH values used. The second group   included Al, Fe, Zn, Ba, Mn and Sr; these were not desorbed in each   individual desorption and not at all pH values, whereas Cu was not desorbed   at all under any circumstances. Using the logarithmic dependence of the metal   content as a function of the desorption number, it was found that potassium   builds two types of links and is connected with weaker links in lichen.   Potassium is completely desorbed, 80% in the first desorption, and then   gradually in the following desorptions. Other metals are linked with one   weaker link (desorption 1-38%) and with one very strong link (desorption   below the metal detection limit). [Projekat Ministarstva nauke Republike   Srbije, br. III43009 i br. ON 172019

Desorption of metals from Cetraria islandica (L.) Ach. Lichen using solutions simulating acid rain