However, the main drawback of this method is low mobility, thus the bioavailability of some heavy metals (especially Pb and Cu) in polluted soils . The use of chelating agents has been proposed to achieve higher removal rates. The use of synthetic chelators, such as ethylenediaminetetraacetic acid (EDTA) and its derivatives, can pose environmental concerns because of their high solubility and persistence in soils. On the contrary, (S,S)-ethylenediamine disuccinic acid (EDDS), an EDTA isomer that is easily biodegradable, has been investigated for chelant-enhanced phytoextraction