Enhanced phytoextraction of Cu, Pb, Zn and Cd with EDTA and EDDS

Abstract

Chemically enhanced phytoextraction has been proposed as an effective approach to removing heavy metals from contaminated soil through the use of high biomass plants.Using pot experiments, the effects of the application of EDTA, EDDS and citric acid on the uptake of Cu, Pb, Zn and Cd by corn (Zea mays L. cv. Nongda 108) and bean (Phaseolus vulgaris L. white bean) plants were studied. The results showed that EDDS was more effective than EDTA at increasing the concentration of Cu in corn and beans.The application of 5 mmol kg -1 soil EDDS application to soil significantly increased concentrations of Cu in shoots , with maximum levels of 2060 and 5130 mg kg -1 DW in corn and beans, respectively, which were 45-fold and 135-fold higher than that in the corresponding control plants to which chelate had not been applied. Concentrations of Zn in shoots were also higher in the plants treated with EDDS than in those treated with EDTA. For Pb and Cd, EDDS was less effective than EDTA. The maximum Cu This is the Pre-Published Version.2 phytoextraction was found with the EDDS treatment. The application of EDTA and EDDS also significantly increased the shoot-to-root ratios of the concentrations of Cu, Pb, Zn and Cd in both plant species. The results of metal extraction with chelates showed that EDDS was more efficient at solubilizing Cu and Zn than EDTA, and that EDTA was better at solubilizing Pb and Cd than EDDS.

Effects of IDSA, EDDS and EDTA on heavy metals accumulation in hydroponically grown maize (Zea mays, L.)

“…Levels of Pb, Zn, Cu and Cd in shoot of hydroponically grown maize were elevated by addition of EDTA, EDDS and IDSA in comparison with the control. EDTA was most effective for Pb accumulation in accordance with many other reports [11,15,[35][36][37].…”

“…In most cases, the EDTA treatment was superior in solubilizing soil Pb for root uptake and translocation into shoot [11,15,[35][36][37] due to its strong chemical affinity for Pb (log Ks = 17.88) [38]. And evidence showed that, the accumulation of Pb in plant shoots was correlated with the formation of the Pb-EDTA complex which was the major form of Pb absorbed and translocated by plants [29,37].…”

Influence of [S, S]-EDDS on Phytoextraction of Copper and Zinc byElsholtzia SplendensFrom Metal-Contaminated Soil

“…EDDS, a structural isomer of EDTA, is a promising new alternative synthetic chelant. The [S, S]-isomer is not only readily biodegradable, but also usually performs as well as EDTA (Grčman et al, 2003;Luo, Shen and Li, 2005;Meers et al, 2005;Schowanek et al, 1997;Tandy et al, 2004;Ultra et al, 2005;Vandevivere et al, 2001). EDDS performs better than EDTA at solubilizing Cu and Zn from soils at pH 7 at equimolar ratios of chelating agent to metals (Hauser et al, 2005).…”

Bacterial-assisted cadmium phytoremediation by Ocimum gratissimum L. in polluted agricultural soil: a field trial experiment

“…Our finding is consistent with other studies. The application of EDTA in soil increased the cadmium solubility, and the cadmium concentration in the shoots of Z. mays and white bean (Phaseolus vulgaris) was reported by Luo et al (2005). Prapagdee et al (2013) show that cadmium accumulation in the whole H. annuus treated with EDTA was higher than that of H. annuus inoculated with cadmium-resistant PGPR.…”