Effects of EDDS application on phytoextraction of cadmium, lead and zinc contaminated soil with Brassica napus

Abstract

Abstract: Cadmium (Cd), lead (Pb) and zinc (Zn) contaminations of soils are a serious worldwide problem that affects human health and environmental quality. Phytoremediation, use of green plants to remove, sequester or detoxify contaminants, offers an environmentally friendly alternative solution for soil remediation. The effect of canola (Brassica napus L.) and a biodegradable chelate, ethylenediamine dissuccinate (EDDS), were tested on remediation of multi metal (Cd, Pb, and Zn) contaminated soil. In the pot experiment, plants were grown for two months on five soil mixtures obtained by mixing an uncontaminated soil sample with 0, 25, 50, 75, and 100% of multiple metal contaminated soil. The biomass of the plants were weighed, and the uptakes of Cd, Pb and Zn in the shoot were determined using ICP-MS. The addition of multi metals to the soil led to the increase of multi metal contents in plants. Consequently, the dry weights of the plants were increased with EDDS treatments in 25 and 50 % multi-metal doses compared to the control treatment. EDDS has significantly increased the uptake of metals (Cd, Pb, and Zn) from the soil and their accumulations in shoots of the plants. The Cd concentration of plant was higher than the hyperaccumulation limit of Cd (>100 mg kg-1 ) with EDDS treatment in 25 and 50% multi-metal doses (141 and 174 mg Cd kg-1 , respectively) except for Zn and Pb concentrations.