Absorption of Zinc and Lead by Dittrichia viscosa Grown in a Contaminated Soil Amended with Olive-Derived Wastes

摘要

Remediation technologies available for reducing the harmful effects in heavy-metal-contaminated soils include excavation (physical removal of the contaminated material) and later replacement with unpolluted soil, stabilization of the metals in the soil on site, and the growing of plants (phytoremediation) to stop the spread of contamination or to extract the metals from the soil. One phytoremediation process is phytostabilization, which consists of combining plant growth and root development with soil amendments in order to decrease the bioavailability and solubility of metals in soils (Wong, 2003) For phytostabilization, plants should develop a strong root system and substantial aerial biomass, should accumulate heavy metals within the roots, and should have restricted translocations of metals from the roots to shoots (De Vos et al. 1991). In addition, natural and synthetic inorganic and organic amendments can be added to the soil to reduce contaminant exposure or to enhance geochemical processes such as precipitation, sorption (Mench et al, 2000).