title: Efficiency of biodegradable EDDS, NTA and APAM on enhancing the phytoextraction of cadmium by Siegesbeckia orientalis L. grown in Cd-contaminated soils.
abstract: Chelant assisted phytoextraction has been proposed to enhance the efficiency of remediation. This study evaluated the effects of biodegradable ethylene diamine tetraacetate (EDDS), nitrilotriacetic (NTA) and anionic polyacrylamide (APAM) on the tolerance and uptake of Siegesbeckia orientalis L. at 10 and 100 mg kg(-1) Cd-contaminated soils. On the 80th and 90th days of transplanting, pots were treated with EDDS and NTA at 0 (control), 1 and 2 mmol kg(-1) soils, and APAM at 0 (control), 0.07 and 0.14 g kg(-1). Generally, the root and shoot biomass of S. orientalis in all treatments reduced not significantly compared with the control, and the activities of peroxidase and catalase in leaves generally increased by the application of chelants (P<0.05). The concentrations of Cd in the shoots were increased significantly by addition of all chelants. As a result, the Cd accumulation of S. orientalis under treatments with higher dosages of the three chelants on the 80th day were 1.40-2.10-fold and 1.12-1.25-fold compared to control at 10 and 100 mg kg(-1) Cd, respectively. Under the addition of 2 mmol kg(-1) NTA on the 80th day, the highest metal extraction ratio reached 1.2% and 0.4% at 10 and 100 mg kg(-1) Cd soils, respectively. Therefore, the applications of EDDS, NTA and APAM may provide more efficient choices in chemical-enhanced phytoextraction.
authors: College of Resources and Environment, Sichuan Agricultural University, Wenjiang 611130, PR China.
authors: Jichuan
authors: J
authors: Lan
authors: Shirong
authors: S
authors: Zhang
authors: Haichuan
authors: H
authors: Lin
authors: Ting
authors: T
authors: Li
authors: Xiaoxun
authors: X
authors: Xu
authors: Yun
authors: Y
authors: Li
authors: Yongxia
authors: Y
authors: Jia
authors: Guoshu
authors: G
authors: Gong
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D019659:Asteraceae / Q000254:growth & development / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002104:Cadmium / Q000737:chemistry / Q000378:metabolism*; D002374:Catalase / Q000378:metabolism; D002614:Chelating Agents / Q000737:chemistry; D004492:Edetic Acid / Q000737:chemistry*; D009571:Nitrilotriacetic Acid / Q000737:chemistry*; D009195:Peroxidase / Q000378:metabolism; D018515:Plant Leaves / Q000201:enzymology; D018520:Plant Shoots / Q000737:chemistry; D012989:Soil Pollutants / Q000737:chemistry / Q000378:metabolism*; D013997:Time Factors; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D002104:Cadmium; D002374:Catalase; D002614:Chelating Agents; D004492:Edetic Acid; D009571:Nitrilotriacetic Acid; D009195:Peroxidase; D012989:Soil Pollutants; D000099166:Polyacrylamides