Enhanced Accumulation Of Cd In Castor (Ricinus Communis L) By Soil-Applied Chelators

Phytoextraction has been identified as one of the most propitious methods of phytoremediation. This pot experiment were treated with varying amounts of (ethylenediamine triacetic acid) EDTA 3-15, (Nitriloacetic acid) NTA 3-10, (Ammonium citrate) NH4 citrate 10 - 25mmol and one mg kg(-1)Cd, filled with 5kg soil. The addition of chelators significantly increased Cd concentration in soil and plant. The results showed that maximum Cd uptake was noted under root, shoot and leaf of castor plant tissue (2.26, 1.54, and 0.72mg kg(-1)) under EDTA 15, NTA 10, and NH4 citrate 25mmol treatments respectively, and in soil 1.08, 1.06 and 0.52mg kg(-1) pot(-1) under NH4 citrate 25, NTA 10 and EDTA 15mmol treatments respectively, as against to control (p < 0.05). Additions of chelators reduction biomass under the EDTA 15mmol as compared to other treatments, However, Bioconcentration factor (BCF), translocation factor (TF) and remediation factor (RF) were significantly increased under EDTA 15 and NH4 citrate 25mmol as against control. Our results demonstrated that castor plant proved satisfactory for phytoextraction on contaminated soil, and EDTA 15 and NH4 citrate 25mmol had the affirmative effect on the Cd uptake in the artificial Cd-contaminated soil.