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Phytoremediation of heavy metal-contaminated soils using high biomass plants.

机译:使用高生物量植物对重金属污染的土壤进行植物修复。

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摘要

The main aim of this research project is to study the phytoextraction of heavy metals from soils with the application of chelates. Screening high-biomass plant species more sensitive to the application of chelates and optimizing chelate application methods were investigated for a better combination of plants and chelate applications to increase the metal phytoextraction efficiency and reduce potential metal leaching to the surrounding environment.; Understanding the mechanisms involved in enhancing metal accumulations in plants through chelate application will be helpful for optimizing chelate-induced phytoremediation. Results showed pretreatments on the roots of Indian mustard with MC, HCl, and hot water increased the concentration of Pb in shoots by 14-, 7-, and 15-fold, respectively, compared with the shoots that had not been pretreated. Using a pot experiment, the biodegradable chelating agent of EDDS was added in a hot solution at 90°C to the soil in which garland chrysanthemum and beans were growing. Results showed when 1 mmol kg -1 of EDDS as a hot solution was applied to soil, the concentrations of Cu, Pb, Zn and Cd and the total phytoextraction by the shoots of the two plant species exceeded or approximated those in the shoots of plants treated with 5 mmol kg-1 of normal EDTA solution. The concentrations of metals in the shoots of beans were significantly correlated with the relative electrolyte leakage rate of root cells, indicating that the root damage resulting from the hot solution might play an important role in the process of chelate-enhanced metal uptake.; Metal leaching study due to chelate application to soil was also carried out immediately after harvesting of the plants in pot experiments. For the treatment of 1 mmol of EDDS, the leached metals decreased to the control group 14 days after the application of EDDS. Therefore, the application of biodegradable EDDS in hot solutions to soil can be a good alternative in chelate-enhanced phytoextraction. (Abstract shortened by UMI.)
机译:该研究项目的主要目的是研究利用螯合剂从土壤中提取重金属的方法。研究了筛选对螯合剂施用更敏感的高生物量植物物种,并优化了螯合剂施用方法,以实现植物与螯合剂的更好结合,从而提高了金属的植物提取效率并减少了对周围环境的潜在金属浸出。了解通过螯合剂施用增加植物中金属积累的机制将有助于优化螯合物诱导的植物修复。结果表明,与未经预处理的芽相比,用MC,HCl和热水对印度芥菜根进行预处理可使芽中Pb的浓度分别增加14倍,7倍和15倍。使用盆栽实验,将EDDS的可生物降解的螯合剂在90°C的热溶液中添加到花环菊花和豆类生长的土壤中。结果表明,当将1 mmol kg -1 EDDS作为热溶液施用于土壤时,两种植物的新芽中的Cu,Pb,Zn和Cd的浓度以及总植物提取量均超过或接近于新芽中的水平。用5 mmol kg-1的正常EDTA溶液处理。豆芽中金属的浓度与根细胞的相对电解质泄漏速率显着相关,表明热溶液导致的根损伤可能在螯合剂增强金属吸收过程中起重要作用。在盆栽实验中收获植物后,还立即进行了由于螯合剂施用于土壤而导致的金属浸出研究。对于1 mmol EDDS的处理,浸出的金属在EDDS施用后14天降至对照组。因此,将可生物降解的EDDS应用于土壤的热溶液中可以作为螯合剂增强植物提取的良好替代方法。 (摘要由UMI缩短。)

著录项

  • 作者

    Luo, Chun Ling.;

  • 作者单位

    Hong Kong Polytechnic University (People's Republic of China).;

  • 授予单位 Hong Kong Polytechnic University (People's Republic of China).;
  • 学科 Agriculture Soil Science.; Environmental Sciences.; Biology Plant Physiology.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 293 p.
  • 总页数 293
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 土壤学;环境科学基础理论;植物学;
  • 关键词

  • 入库时间 2022-08-17 11:39:29

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