An evaluation of EDTA additions for improving the phytoremediation efficiency of different plants under various cultivation systems

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• 作者：Jie Luo ; Shihua Qi ; X. W. Sophie. Gu ; Jinji Wang ; Xianming Xie
• 关键词：Eucalyptus globulus ; Cicer arietinum ; Phytoremediation ; Heavy metals ; EDTA
• 刊名：Ecotoxicology
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：25
• 期：4
• 页码：646-654
• 全文大小：501 KB
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• 作者单位：Jie Luo (1) (3)
  Shihua Qi (1)
  X. W. Sophie. Gu (2)
  Jinji Wang (3)
  Xianming Xie (3)
  
  1. China University of Geosciences, Wuhan, 430074, China
  3. Guangdong Hydrogeology Battalion, Guangzhou, 510510, China
  2. The University of Melbourne, Victoria, VIC, 3010, Australia
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  Ecology
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-3017

文摘

Previous studies have shown that phytoremediation usually requires soil amendments, such as chelates, to mobilize low bioavailability heavy metals for better plant absorption and, consequently, for remediation efficiency. A total dry biomass of 3.39 and 0.0138 kg per plant was produced by a phytoremediator, Eucalyptus globulus, and a nitrogen fixing crop, Cicer arietinum (chickpea), respectively. The accumulation of Pb in E. globulus and chickpea reached 1170.61 and 1.33 mg per plant (700 and 324 mg kg−1), respectively, under an ethylene diamine tetraacetic acid (EDTA) treatment, which was a five and sixfold increase over the value in untreated experiments, respectively. EDTA enhanced the phytoremediation efficiency and increased the heavy metal concentration in the soil solution. In pot experiments, approximately 27 % of the initial Pb leached from the spiked soil after EDTA and 25 mm artificial precipitation additions into soil without plants, which was considerably larger than the value under the same conditions without EDTA application (7 %). E. globulus planted in a mixed culture had higher water use efficiency than monocultures of either species in field experiments, and E. globulus intercepted almost all of the artificial precipitation in the pot experiments. This study demonstrates that E. globulus can maximize the potential of EDTA for improving the phytoremediation efficiency and minimizing its negative effects to the environment simultaneously by absorbing the metal-rich leachate, especially in a mixed culture of E. globulus and chickpeas.