Comparison phytoextraction of pb, cd, cu and zn by three plant species: cyperusesculentus, daturainnoxia and ricinuscommunis

Background: Population’s exponential growth leads to an increase of human activities that brings large amounts of pollutants that contaminate soils and century plants by metallic elements Trace (ETM). These, like Cu, Pb and Cd cause serious issues. Material and methods: In this study, experiments in culture pots were conducted. Three plant species, Cyperusesculentus, Daturainnoxia and Ricinuscommunis were tested. Cultures were made in two soil types (low polluted and highly polluted soils) contaminated by ETM Cd, Cu, Pb and Zn. They were watered daily with tap water. Results: After one month of culture, the results showed that in the low polluted soil, Cyperusesculentus reduced by 110.96%, 0.025% and 51.26% respectively for an initial Zn concentration of 66.8 mg / kg, in Pb of 61.31mg / kg and in Cu of 33.61%. In highly polluted soil, it reduced by 10.63%, 120%, 34.67% and 44.27% respectively for an initial Pb concentration of 125 mg / kg, Cd of 0.58 mg / kg, Cu of 208.48 mg / kg and Zn of 139.83 mg / kg. In the low polluted soil, Daturainnoxia reduced by 110.96%, 0.025% and 51.26% respectively an initial Zn concentration of 66.8 mg / kg, Pb of 61.31 mg / kg and Cu of 33.61%. While in high polluted soil, it reduced by 10.63%, 120%, 34.67% and 44.27% respectively for an initial Pb concentration of 125 mg / kg, Cd of 0.58 mg / kg, Cu of 208.48 mg / kg and Zn of 139.83 mg / kg. In the case of Ricinuscommunis, this plant species reduced by 110.96%, 0.025% and 51.26% in the low polluted soil respectively for an initial Zn concentration of 66.8 mg / kg, Pb of 61.31 mg / kg and Cu of 33.61%. %. In the highly polluted soil, she reduced by 10.63%, 120%, 34.67% and 44.27%, respectively, an initial Pb concentration of 125 mg / kg, a Cd of 0.58 mg / kg, a Cu of 208.48 mg / kg and a Zn of 139.83 mg / kg. Conclusion: These three plant species are a very good subjects for phytoremediation of multipolluted soils by MTEs like Pb, Cd, Cu and Zn.