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 C.A. Pigott, China in the world economy: The domestic policy challenges. OECD Publishing, (2002).
 C.M. Hogan, Water pollution, Encylopedia of earth topic, Washington, DC, Cleveland National Council on Science and Environment, (2010).
 A. Mazeikiene et al., Removal of nitrates and ammonium ions from water using sorbent zeolite (clinoptitolite), Journal of Environmental Engineering and Landscape Management. 16(1) (2008) 38-44.
 H. Bouwer, Agricultural contaminants, problems and solutions, Water Environment and Technology. 1(2) (1989) 292- 297.
 S. Samatya et al., Removal of nitrate from aqueous solution by nitrate selective ion exchange resins, Reactive and Functional Polym. 66(11) (2006) 1206-1214.
 N.B. Ladimir, Environmental Chemistry: Asian Lessons, New York, Boston, Dordrecht, London, Moscow, Kluwer Academic Publishers, (2003).
 A.O. Eruola, I.O. Ogunyemi, Evaluation of the Adsorption Capacity of the Coconut Shell and Palm-Kernel Shell Adsorbents Powder for the Sorption of Cadmium (11) Ions from Aqueous Solution, Journal of Environmental Science, Toxicology and Food Technology. 8(6) (2014).
 M. Horsfall, A.L. Spiff, A.A. Abia, Studies on the influence of mercaptoacetic acid (MAA) modification of cassava (manihot sculenta cranz) waste biomass on the adsorption of Cu 2+ and Cd 2+ from aqueous solution, Bulletin of the Korean Chemical Society. 25(7) (2004).
 J. Crittenden et al., Water Treatment: Principles and Design, John Wiley and Sons, (2005).
 N.A. Oladojaa et al., Sorption of Cu (II) ion from aqueous solution by scrap tyre, Desalination and Water Treatment. 16 (2010) 83–94.
 K.A. Krishnan, T.S. Anirudhan, Removal of cadmium(II) from aqueous solutions by Steam activated sulphurised carbon prepared from sugar-cane bagasse pith: kinetics and equilibrium studies, Water SA. 29 (2003) 147–156.
 K.S. Low, C.K. Lee, S.C. Liew, Sorption of cadmium and lead from aqueous solutions by spent grain, Process Biochemistry. 36 (2000) 59–64.
 T.K. Naiya, A.K. Bhattacharya, S.K. Das, Adsorptive removal of Cd(II) ions from aqueous solutions by rice husk ash, Environmental Progress in Chemical Engineering. 28 (2009) 535-546.
 F.E. Okieiman, E.V. Okundla, D.E. Ogbeifun, Sorption of cadmium and leadions on modified groundnut (Arachis hypogea) husks, Journal of Chemical Technology and Biotechnology. 51 (1991) 97–103.
 L. Nouri et al., Batch sorption dynamics and equilibrium for the removal of cadmium ions from aqueous phase using wheat bran, Journal of Hazardous Material. 149(1) (2007) 115-125.
 N.A. Oladoja, C.O. Aboluwoye, Y.B. Oladimeji, Kinetics and Isotherm Studies on Methylene Blue Adsorption onto Ground Palm Kernel Coat, Turkish J. Eng. Env. Sci. 32 (2008) 303–312.
 R.B. Larley, F. Acqual, Developing national capability for manufacture of activated carbon from agricultural waste, Ghana Eng. 19(1) (1999) 1-2.
 M.J. Rosen, Surfactant and interfacial phenomenon, John Willey, New York, (1978).
 O. Zanella, I.C. Tessaro, L.A. Feris, Nitrate Sorption on activated carbon modified with CaCl2, Chem. Ind. Chem. Eng. Q. 21(1) (2015) 23−33.
 M. El Ouardi et al., Effective Removal of Nitrates Ions from Aqueous Solution Using New Clay as Potential Low-Cost Adsorbent, Journal of Encapsulation and Adsorption Sciences, 5(4) (2015) 178-190.
 C.H. Giles et al., Studies in adsorption. Part XI. A system of classification of solution adsorption isotherms, and its use in diagnosis of adsorption mechanisms and in measurement of specific surface areas of solids, Journal of the Chemical Society. (1960).
 C. Namasivayam, D. Sangeetha, Removal and recovery of nitrate from water by ZnCl~ 2 activated carbon from coconut coir pith, an agricultural solid waste, Indian J. Chem. Technol. 12(5) (2005) 513–521.
 R. Chitraker et al., Selective adsorption of phosphate for Seawater and wastewater by amorphous zirconium hydroxide, Journal of colloid and interface science. 297(2) (2006) 426-433.
 A. Shukla et al. The role of sawdust in the removal of unwanted materials from water, Journal of Hazardous Materials. 95(1-2) (2002) 137-152.
 L.J. Yu et al., Adsorption of chromium from aqueous solutions by maple sawdust, Journal of Hazardous Materials. 100(1-3) (2003) 53-63.
 L. Mathurasa, S. Damrongsiri, "Low cost and easy rice husk modification to efficiently enhance ammonium and nitrate adsorption", International Journal of Recycling of Organic Waste in Agriculture, Vol. 7, p. 143, 2018DOI: https://doi.org/10.1007/s40093-018-0200-3