چكيده لاتين :
The adsorption of heavy metals onto treated Azolla filiculoides by HzOiMgClz, as a cosmopolitan free-floating
waterfern, was investigated from aqueous solutions in the batch biosorption experiments. The maximum uptake
capacities of the collected Azolla from rice field at the optimal conditions for Pb, Cd, Cu and Zn ions were
approximately 228,86,62 and 48 mg/g (dry Azolla), respectively. On the other hand, the maximumuptake capacities
of the collectedAzolla from the Anzali International Wetland in the north part of Iran at the same conditionsfor these
heavy metals were about 124, 58,33 and 34 mg/g (dry Azolla), respectively. Such decrease of uptakes is due to the
pollution of Anzali International Wetland, which reduces the capacity uptake of metals. The recovery of biosorbed
heavymetals from the rice field Azolla was carried out byHCl and NaCI desorbentsthat the recovery of 64- 86%and
51-72%was occurred, respectively
