Chernykh G.P., Chernykh E.A., Emelyanov I.S. Synthesis and study of the chromatographic properties of sulfocationites. // J. adj. Chemistry, 1997.V. 70. Vol. 12. -S.1970-1974 2. Pulatov Kh.L. Khudaiberdiev B., Rakhimova L.S., Mutalov Sh.A., Abdutalipova N.M., Tursunov T.T., Nazirova R.A. Polycondensation sulfocationionites // St. Petersburg Conference "Science of Polymers". St. Petersburg, 2013.-S.231-233 3. Sharipova U. I., Pulatov H.L., Nazirova R.A., Mutalov Sh.A. Synthesis and properties of phosphorus-containing cation exchange resin of the polycondensation type // Abstracts of the 3rd St. Petersburg Conference of Young Scientists "Modern Problems of the Science of Polymers", St. Petersburg, 2007. - P.106 4. Krylov E. A., Rabinovich I. B. Physical state diagrams of cation-water systems depending on the type of salt forms // Int. Conf. "The Probl. Solvat. And Complex Format. Solut.", Ivanovo, June 29 - July 2, 1998. - P.394 5. Sokolova Yu.V. Some regularities of Sc (III) recovery by phosphorus-containing ion exchangers // J. Prikl. Chemistry, 2006. - No. 4. - T.79. - S. 583-588. 6. Naibova T.M., Abbasova K.G. Obtaining cation exchange resin by sulfonation of a modified phenol-formaldehyde oligomer // J. Scientific Publ. Ph.D. and doctoral students, 2012. - No. 8. - S.66-67 7. Pimneva L.A. Peculiarities of the joint sorption of yttrium, barium and copper ions in the phase of phosphate cation exchanger // Sovrem.problem. Nauki i Obraz, 2015.- №2.– P.71 8. Berdieva M.I., Mutalov Sh.A., Rakhimova L.S., Tursunov T.T., Nazirova R.A. Obtaining new types of polycondensation-type ion exchangers // “Youth and the 21st Century -2015” Materials of the V International Scientific Conference, February 26-27, 2015, Kursk-2015, Volume 3. - P.39-42 9. Turobzhonov S.M., Pulatov H.L., Tursunov T.T., Sharipova U.I., Nazirova R.A. The study of sorption and desorption of certain ions by phosphate cation exchange resin // Composite materials, 2010. - No. 2. - S. 38-41. 10. Pulatov Kh.L., Turabjanov S.M., Tursunov T.T., Nazirova R.A. Obtaining of phosphoric acid cation-exchange resins for wastewater treatment from heavy metal ions// Proceedings of the International conference on integrated innovative development of Zarafshan region: achievements, challenges and prospects. – Navoi, 2017, 26-27 October. - P.365-369 11. Pulatov Kh.L. Synthesis and research of sorption properties of phosphoric cationite of polycondensation type // Science of Central Asia. №1, 2010. - P.76-79. 12. Nomngongo Philiswa N., Catherine Ngila J., Kamau Joseph N., Msagati Titus A.M., Marjanovic Ljiljana, Moodley Brenda. Pre-concentration of trace elements in short chain alcohols using different commercial cation exchange resins prior to inductively coupled plasma-optical emission spectrometric detection // Anal.chim.acta. – Netherland, 2013. – I.787. – P.78-86. 13. Vignoli Claudio Nogueira, ah e Jac eline M.C. ., Marques Monica .C. valuation of ion exchange resins for removal and recuperation of ammonium-nitrogen generated by the evaporation of landfill leachate// Polym.Bull., 2015.- № 12.– P.3119-3134. 14. Rajindar Singh. Chapter 13 – Development of Hybrid Processes for High Purity Water Production. Emerging Membrane Technology for Sustainable Water Treatment, 2016, p. 327 – 357. 15. Herbert E. Klei, Donald W. Sundstrom, Chapter 13 – Ion exchange. Wastewater Treatment, 1981, p. 356 – 367. Chemistry and chemical technology 100 16. I-Hsien Lee, Yu-Chung Kuan, Jia-Ming Chern, Equilibrium and kinetics of heavy metal ion exchange // Journal of the Chinese Institute of Chemical Engineers. – 2007. vol. 38. -p. 71 – 84. 17. Erol Pehlivan, Turkan Altun, Ion-exchange of Pb2+, Cu2+, Zn2+, Cd2+ and Ni2+ ions from aqueous solution by Lewatit CNP 80 // Journal of Hazardous Materials. – 2007. vol – 140. p. 299 – 307.