R. A. Wuana, F. E. Okieimen and J. A. Imborvungu, “Removal of Heavy Metals from a Contaminated Soil Using Organic Chelating Acids,” International Journal of Environment Science and Technology, Vol. 7, No. 3, 2010, pp. 485-496.
 D. E. Crowley, Y. C. Wang, C. P. P. Reid and P. J. Szanislo, “Mechanism of Iron Acquisition from Siderophores by Microorganism and Plants,” Plant and Soil, Vol. 130, No. 1-2, 1991, pp. 179-198. doi:10.1007/BF00011873
 M. N. V. Prasad and H. M. O. Freitas, “Metal Hyperaccumulation in Plants—Biodiversity Prospecting for Phytoremediation Technology,” Electronic Journal of Biotechnology, Vol. 6, No. 3, 2003, p. 3. doi:10.2225/vol6-issue3-fulltext-6
 J. W. Huang, J. Chen, W. R. Berti and S. D. Cunningham, Phytoremediation of Lead-Contaminated Soils: Role of Synthetic Chelates in Lead Phytoextraction,” Environmental Science and Technology, Vol. 31, No. 3, 1997, pp. 800-805. doi:10.1021/es9604828
 V. Sykora, P. Pitter, I. Bittnerova and T. Lederer, “Biodegradability of Ethylenediamine-Based Complexing Agents,” Water Researcher, Vol. 35, No. 8, 2001, pp. 2010-2016. doi:10.1016/S0043-1354(00)00455-3
 D. V. Greman, S. Velikonja-Bolta and D. Lestan, “Ethylenediaminedissucinate as a New Chelate for Environmentally Safe Enhanced Phytoextraction,” Journal of Environmental Quality, Vol. 32, No. 2, 2003, pp. 500-506.
 L. H. Wu, Y. M. Luo, X. R. Xing and P. Christie, “EDTAEnhanced Phytoremediation of Heavy Metal Contaminated Soil with Indian Mustard and Associated Potential Leaching Risk,” Agriculture, Ecosystem and Environment, Vol. 102, No. 3, 2004, pp. 307-318. doi:10.1016/j.agee.2003.09.002
 D. Lestan and H. Greman, “Chelate Enhanced Pb Phytoextraction in Plant Uptake, Leaching and Toxicity,” 17th WCSS World Congress of Soil Science, Bangkok, 14-21 August 2002, Symposium 42, Paper 1701.
 S. Van Slycken, E. Meers, L. Meiresonne, N. Witters, K. Adriaensen, A. Peene, W. Dejonghe, T. Thewys, J. Vangronsveld and F. M. G. Tack, “The Use of Bio-Energy Crops for Phytoremediation of Metal Enriched Soils in the Campine Region,” Communications in Agricultural and Applied Biological Sciences, Vol. 73, No. 1, 2008, pp. 19-22.
 A. Walkley and I. A. Black, “An Examination of the Method for Determining Soil Oganic Matter and Proposed Modification of the Chromic Acid Titration Method,” Soil Science, Vol. 37, No. 1, 1934, pp. 29-28. doi:10.1097/00010694-193401000-00003
 H. Y. Lai and Z. S. Chen, “Effects of EDTA on Solubility of Cadmium, Zinc and Lead and Their Uptake by Rainbow Pink and Vertivers Grass,” Chemosphere, Vol. 55, No. 3, 2004, pp. 421-430. doi:10.1016/j.chemosphere.2003.11.009
 E. Lombi, F. J. Zhao, S. J. Dunham and S. P. McGrath, “Phytoremediation of Heavy Metal Contaminated Soils: Natural Hyper Accumulation versus Chemically Enhanced Phytoextraction,” Journal of Environmental Quality, Vol. 30, No. 6, 2001, pp. 1919-1926. doi:10.2134/jeq2001.1919
 E. Meers, M. Hopgood, E. Lesage, F. M. G. Tack and M. G. Verloo, “Enhanced Phytoextraction: In Search of EDTA Alternatives,” International Journal of Phytoremediation, Vol. 6, No. 2, 2004, pp. 95-109. doi:10.1080/16226510490454777
 A. T. Ruley, N. C. Sharna, S. V Sahi, S. R. Singh and K. S. Sajuran, “Effects of Lead and Chelators on Growth, Photosynthetic Activity and Pb Uptake in Sesbania drummondii Grown in Soil,” Environmental Pollution, Vol. 144, No. 1, 2006, pp. 11-18. doi:10.1016/j.envpol.2006.01.016
 K. Wenger, A. Kayser, S. K. Gupta, G. Furvts and R. Schulin, “Comparison of NTA and Elemental Sulphur as Potential Soil Amendments in Phytoremediation,” Soil and Sediment Contamination, Vol. 11, No. 5, 2002, pp. 655-672. doi:10.1080/20025891107023
 L. H. Wu, Y. H. Luo, P. Christie and M. H. Wong, “Effects of EDTA and Low Molecular Weight Organic Acids on Soil Solution Properties of a Heavy Metal Polluted Soil,” Chemosphere, Vol. 50, No. 6, 2003, pp. 819-822. doi:10.1016/S0045-6535(02)00225-4
 H. Y. Lai and Z. S. Chen, “The EDTA Effect on Phytoextraction of Single and Combined Metals-Contaminated Soils Using Rainbow Pink (Dianthus chinensis),” Chemosphere, Vol. 60, No. 8, 2005, pp. 1062-1071. doi:10.1016/j.chemosphere.2005.01.020