Hot NTA application enhanced metal phytoextraction from contaminated soil

Chun Ling Luo, Zhen Guo Shen, Xiangdong Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

26 Citations (Scopus)

Abstract

To increase the phytoextraction efficiency of heavy metals and to reduce the potential negative effects of mobilized metals on the surrounding environment are the two major objectives in a chemically enhanced phytoextraction process. In the present study, a biodegradable chelating agent, NTA, was added in a hot solution at 90°C to soil in which beans (Phaseolus vulgaris L., white bean) were growing. The concentrations of Cu, Zn and Cd, and the total phytoextraction of metals by the shoots of the plant from a 1 mmol kg-1hot NTA application exceeded those in the shoots of plants treated with 5 mmol kg-1normal NTA and EDTA solutions (without heating treatment). A significant correlation was found between the concentrations of metals in the shoots of beans and the relative electrolyte leakage rate of root cells, indicating that the root damage resulting from the application of a hot solution might play an important role in the process of chelate-enhanced metal uptake in plants. The application of hot NTA solutions did not significantly increase metal solubilization in soil in comparison with a normal application of solution of the same dosage. Therefore, the application of a hot NTA solution may provide a more efficient alternative in chemical-enhanced phytoextraction, although further studies of techniques of application in fields are sill required.
Original languageEnglish
Pages (from-to)127-137
Number of pages11
JournalWater, Air, and Soil Pollution
Volume188
Issue number1-4
DOIs
Publication statusPublished - 1 Feb 2008

Keywords

  • Beans
  • Hot NTA
  • Metals
  • Phytoextraction
  • Root damage

ASJC Scopus subject areas

  • Atmospheric Science
  • Pollution
  • Environmental Science(all)
  • Environmental Chemistry
  • Water Science and Technology
  • Earth-Surface Processes

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