work the biosorption behavior of Lemna spp. of the family Lemnaceae was investigated as a function of pH, amount of biosorbent and initial Zn concentration. The aim of this study was to investigate the capacity of small free floating aquatic macrophytes namely: L. minuta, L. minor and L. trisulca L. to purify waters polluted by Zn Metal bioaccumulation process was affected by various values of pH and concentration of zinc solution. Plants treated with 15 mg/L of Zn accumulated 18366.4±2614 mg/kg DW of Zn. The highest bioconcentration potential of Zn was observed by L. trisculca (97%), L. minuta (89%) and L. minor (83%). The metal was accumulated in higher amount in dry biomass with increasing Zn levels. Bioconcentration Factor (BCF) ranged between 391 and 2955 for the three species. L. trisulca showed the highest bioconcentration potential. The results indicated that the biomass of Lemna spp. Is suitable for development of efficient biosorbent for the removal of zinc from wastewater of chemical and allied process industries.
