Improving of copper (II)-Ions phytoextraction by using glycolipid biosurfactants
Abstract
Pollution of soil with heavy metals is a dangerous issue that endangers both the environment and human health. Phytoextraction, that implies planting contaminated area by previously selected species of plants having the potential to extract heavy metals from the soil, is common used technology. Some limitations of this technology revealed in difficulty to absorb the heavy metals, usually being in form of insoluble. For aim to increase the phytoextraction efficiency it is necessary to use agents able of solubilization of heavy metals. The aim of presented work is to test some biosurfactants for enhancing copper(II) phytoextraction by different pla-nt species. For this purpose, the model experiments for cleaning of water and soils artificially contaminated with copper(II) ions have been carried out. The obtained results show that rhamnolipids and trehalose lipids increase the phytoextraction effecti-veness significantly (2-3 times). Alfalfa with trehalose lipids are the most effective tools for cleaning soils contaminated with cop-per(II) ions. In this case removal of heavy metal from soil is achieved by 75%, and main part of removed copper(II) ions (appro-ximately 60%) is translocated in upper ground parts of plant that is very important for performing phytoextraction process succ-essfully.