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| EDTA and EDDS Enhanced Remediation of Cd and Pb Contaminated Soil by Ramie(Boehmeria Nivea) |
| Received:January 26, 2015 |
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| KeyWord:EDDS;EDTA;ramie;contaminated soil;enhanced remediation |
| Author Name | Affiliation | E-mail | | LIU Jin | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China | | | YIN Xian-qiang | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | xianqiangyin@yahoo.com | | SUN Hui-min | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | LÜ Jia-long | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | WEI Ge-hong | College of Life Science, Northwest A&F University, Yangling 712100, China | |
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| Abstract: |
| Ramie(Boehmeria nivea) has showed potential to remediate heavy metal contaminated soils. However, low availability of heavy metals in soils limits the remediation efficiencies. Here a pot experiment was conducted to assess the effects of two chelating agents, ethylene diamine disuccinate(EDDS) and ethylene diamine tetraacetate(EDTA), on the uptake of Cd and Pb by ramie in Cd and Pb contaminated yellow-cinnamon soil. Biomass and malondialdehyde(MDA) content of ramie and concentrations of Cd and Pb in both different parts of ramie and soil were measured. The total content of Cd and Pb in leaf, shoot and root of ramie grown in EDTA and EDDS treated soils increased significantly, suggesting the activation of heavy metals in the soils. At 1.5 mmol·kg-1 to 3 mmol·kg-1 of chelating agents, EDDS performed better in Cd accumulation than EDTA did, with Cd removal being 16% to 27% greater than the control(no chelating agent). At higher than 3 mmol·kg-1 of chelating agents, however, ramie with EDTA treatment had higher Cd concentration than that with EDDS. For Pb contaminated soil, EDTA activated Pb better than EDDS did, and the removal efficiency of Pb by ramie increased by up to 22.6%. Applications of both EDTA and EDDS reduced ramie biomass but improved the content of MDA in leaves. However, EDDS showed less adverse effects on ramie than EDTA did at the same concentrations. |
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