Serikpayeva, S.B., Erzhanova, N.S., Iminovа R.S., Zhumagaliyeva, S.N., Beysebekov, M.K. and Abilov, Z.A. 2015. Possibilities of composite materials use on the basis of polivinilipirrolidon and bentonite clay as sorbents of heavy metals ions. International Journal of Biology and Chemistry. 8, 2 (Dec. 2015), 77–80. DOI:https://doi.org/10.26577/2218-7979-2015-8-2-77-80.