论文说明：LIST OF TABLES and LIST OF FIGURES
声明
ACKNOWLEDGEMENTS
摘要
CHAPTER 1 Introduction
1.1 Research problem
1.2 Research objectives
1.3 Hypothesis
CHAPTER 2 Literature Review
2.1 Heavy metal toxicity in plants
2.1.1 Chromium in the environment
2.1.2 Sources and phytotoxic effects of Cr
2.1.3 Chromium uptake, translocation and accumulation in plants
2.1.4 Cadmium and phytotoxicity
2.1.5 Lead and phytotoxicity
2.1.6 Copper and phytotoxicity
2.2 Remediation of metal polluted soil
2.3 Phytoextraction
2.3.1 Natural or continuous phytoextraction using hyperaccumulators
2.3.2 Artificial or chemically enhanced phytoextraction using chelating agents
2.4 Wetland plants
2.5 Cattails
CHAPTER 3 Evaluation of Typha angustifolia for Cr Toxicity Tolerance and its Possible Role in Phytoremediation
3.1 Introduction
3.2 Materials and methods
3.3 Results
3.3.1 Plant height and biomass
3.3.2 SOD, POD activities and MDA content
3.3.4 Four microelement concentrations
3.3.5 Correlations between Cr and four microelements
3.4 Discussion
CHAPTER 4 Comparison of EDTA and Citric Acid- Enhanced Phytoextraction of Heavy Metals in Artificially Metal Contaminated Soil by Typha angustifolia
4.1 Introduction
4.2 Materials and Methods
4.2.1 Soil collection and artificial heavy metal contamination
4.2.2 Plant materials and chelator treatments
4.2.3 Sampling and measurements
4.2.4 Soil metal dissolution and as affected by chelators
4.2.5 Statistical analysis
4.3 Results
4.3.1 Effect of chelator addition on plant biomass of T. angustifolia
4.3.2 Effect of chelators on tissue metal concentration of T. angustifolia plants
4.3.3 Effect of chelators on metal accumulation by plants
4.3.4 Effects of chelator addition on metal solubility in soil
4.4 Discussion
REFERENCES
