S. Tong, Y. E. von Schirnding and T. Prapamontol, “Environmental Lead Exposure: A Public Health Problem of Global Dimensions,” Bulletin of the World Health Organization, Vol. 78, No. 9, 2000, pp. 1068-1077.
 L. J. Fewtrell, A. Pruss-Ustun, P. Landrigan and J. L. Ayuso-Mateos, “Estimating the Global Burden of Disease Of Mild Mental Retardation And cardiovascular diseases from Environmental Lead Exposure,” Environmental Research, Vol. 94, No. 2, 2004, pp. 120-133. doi:10.1016/S0013-9351(03)00132-4
 U. Forstner, “Land Contamination by Metals: Global Scope and Magnitude of Problem,” In: H. E. Allen, C. P. Huang, G. W. Bailey and A. R. Bowers, Eds., Metal Speciation and Contamination of Soil, CRC Press, Boca Raton, 1995, p. 133.
 J. Cotter-Howells and I. Thornton, “Sources and Pathways of Environmental Lead to Children in a Derbyshire Mining Village,” Environmental Geochemistry and Health, Vol. 13, No. 2, 1991, pp. 127-135.
 Q. Y. Ma, T. J. Logan and S. J. Traina, “Lead Immobilization from Aqueous Solutions and Contaminated Soils Using Phosphate Rocks,” Environmental Science & Technology, Vol. 29, 1995, pp. 1118-1126.
 R. L. Canfield, C. R. Henderson Jr., D. A. Cory-Slechta, C. Cox, T. A. Jusko and B. P. Lanphear, “Intellectual Impairment in Children with Blood Lead Concentrations below 10 μg Per Deciliter,” The New England Journal of Medicine, Vol. 348, 2003, pp. 1517-1526. doi:10.1056/NEJMoa022848
 M. L. Miranda, K. Dohyeong, M. A. Galeano, C. J. Paul and A. P. Hull, “Morgan, S. P. The Relationship between Early Child Hood Blood Lead Levels and Performance on End-of-Grade Tests,” Environmental Health Perspectives, Vol. 115, 2007, pp. 1242-1247.
 R. Nevin, “Trends in Preschool Lead Exposure, Mental Retardation, and Scholastic Achievement: Association or Causation?” Environmental Research, Vol. 109, No. 3, 2009, pp. 301-310. doi:10.1016/j.envres.2008.12.003
 R. A. Shih, H. Hu, M. G. Weisskopf and B. S. Schwartz, “Cumulative Lead Dose and Cognitive Function in Adults. A Review of Studies that Measured both Blood Lead and Bone Lead,” Environmental Health Perspectives, Vol. 115, 2007, pp. 483-492.
 J. L. Lin, D. T. Lin-Tan, K. H. Hsu and C. C. Yu, “Environmental Lead Exposure and Progression of Chronic Renal Diseases in Patients without Diabetes,” New England Journal of Medicine, Vol. 348, 2003, pp. 277-286.
 M. I. Lone, Z.-L. He, P. J. Stopffella and X.-E. Yang, “Phytoremediationof Heavymetal Polluted Soils and Water: Progresses and Perspectives,” Journal of Zhejiang University Science B, Vol. 9, No. 3, 2008, pp. 210-220. doi:10.1631/jzus.B0710633
 R. L. Chaney, M. Malik, Y. M. Li, S. L. Brown, E. P. Brewer, J. Scott-Angle and A. J. M. Baker, “Phytoremediation of Soil Metals,” Current Opinion in Biotechnology, Vol. 8, No. 3, 1997, pp. 279-284. doi:10.1016/S0958-1669(97)80004-3
 D. E. Salt, M. Blaylock, P. B. A. N. Kumar, V. Dushenkov, B. D. Ensley, L. Chet and L. Raskin, “Phytoremediation: A Novel Strategy for the Removal of Toxic Metals from the Environment Using Plants,” Biotechnology, Vol. 13, No. 5, 1995, pp. 468-474. doi:10.1038/nbt0595-468
 M. Sihl, M. A. Hajabbasi and H. Shareatmadari, “Heavy Metal Extraction Potential of Sunflower (Helliantus annus) and Canola Brassica napus,” Caspian Journal of Environmental Sciences, Vol. 3, No. 1, 2005, pp. 35-42.
 R. D. Armstrong, M. Todd, J. W. Atkinson and K. Scott, “Selective Electrodeposition of Metals from Simulated Waste Solutions,” Journal of Applied Electrochemistry, Vol. 26, No. 4, 1996, pp. 379-384.
 N. Lathan, S. Edwards, C. Thomas and L. Agwaramgbo, “Comparative Study of Lead Removal by Extracts of Spinach, Coffee, and Tea,” Journal of Environmental Protection, Vol. 4, 2013, pp. 250-257. doi:10.4236/jep.2013.43029
 L. Agwaramgbo, C. Thomas, C. Grays, J. Small and T. Young, “An Evaluation of Edible Plant Extracts for the Phytoremediarion of Lead Contaminated Water,” Journal of Environmental Protection, Vol. 3, No. 8, 2012, pp. 722-730. doi:10.4236/jep.2012.38086
 L. Agwaramgbo, E. Agwaramgbo, C. Mercadel, S. Edwards and E. Buckles, “Lead Remediation of Contaminated Water by Charcoal, LA Red Clay, Spinach, and Mustard Green,” Journal of Environmental Protection, Vol. 2, No. 9, 2011, pp. 1240-1244. doi:10.4236/jep.2011.29142
 P. Stathi, K. Litina, D. Gournis, T. S. Giannopoulos and Y. Deligiannakis, “Physicochemical Study of Novel Organoclay as Heavy Metal Ion Adsorbents for Environmental Remediation,” Journal of Colloid and Interface Science, Vol. 316, 2007, pp. 298-309.
 S. P. Singh, L. Q. Ma and W. G. Harris, “Heavy Metal Interactions with Phosphate Clay: Sorption and Desorption Behavior,” Journal of Environmental Quality, Vol. 30, 2001, pp 1961-1968. doi:10.2134/jeq2001.1961
 l. M. Mataka, E. M. T. Henry, W. R. L. Masamba and S. M. Sajidu, “Lead Remediation of Contaminated Water Using Moringa stenopetala and Moringa oleifera Seed Powder,” International Journal of Environmental Science and Technology, Vol. 3, No. 2, 2006, pp. 131-139. doi:10.1021/jf0496402
 C. M. Zvinowanda, J. O. Okonkwo, P. N. Shabalala and N. M. Agyei, “A Novel Adsorbent for Heavy Metal Remediation in Aqueous Environment,” International Journal of Environmental Science and Technology, Vol. 6, No. 3, 2009, pp. 425-434.
 J. C. Igwe, A. A. Abia and C. A. Ibeh, “Adsorption Kinetics and Intraparticulate Diffusivities of Hg, As, and Pb Ions on Unmodified and Thiolated Coconut Fiber,” International Journal of Environmental Science and Technology, Vol. 5, No. 1, 2008, pp. 83-92.
 M. Aliabadi, K. Morshedzadeh and H. Soheyli, “Removal of Hexavalent Chromium from Aqueous Solution by Lignocellulosic Solid Wastes,” International Journal of Environmental Science and Technology, Vol. 3, No. 3, 2006, pp. 321-325.