THE LEAD PHYTOEXTRACTION AND THE EDTA-INDUCED HYPERACCUMULATION. CYCLE I PUBLISHEDEugenia Gamenţ, Georgiana Plopeanu, Nicoleta Vrînceanu, Vera Carabulea
Phytoremediation is a new technology used for remediation the agricultural and industrially soils contaminated/polluted with heavy metals. One of the phytoremediation techniques, the so-called phytoextraction, is a method to extract heavy metals from contaminated/polluted soils using hyperaccumulators plants and to translocate them to shoots. This case study presents the effects of ethilene diamine tetraacetic acid (EDTA) application as a potential amendment for an artificial contaminated soil with Pb to enhance the translocation capacity in the harvestable plant parts of maize. The treatments consisted in the application of some Pb concentrations (1000 mgPb·kg -1 , 2000 mgPb·kg -1 , 3000 mgPb·kg -1 ) in combination with different levels of EDTA (expressed as molar ratio between EDTA and Pb). The aim of EDTA added was to mobilise and increase metal accumulation in maize, Pb being one of the largest immobile heavy metals in soil. Obtained data revealed the significant differences concerning the biomass and the height of the plants and the Pb contents in the leaves according to the treatment applied. In the first experimental cycle were established the EDTA:Pb optimal rations soil needed to increase the lead bioaccessibility for each of the three loading degree with (1000 mgPb·kg -1 , 2000 mgPb·kg -1 , 3000 mgPb·kg -1 ).
phytoextraction; soil pollution; Pb; EDTA