TY JOUR TI EXTRACTION PROPERTIES OF SULFUR-CONTAINING OLIGOMERS BASED ON CHLOREX KW sulfur-containing oligomers KW chlorex KW hydrazine hydrate-MEA system KW extractants KW heavy metals ions JO Modern Technologies and Scientific and Technological Progress AU Nalibaeva, A.M. AU Abdikalykov, E.N. AU Grabel'nyh, V.A. AU Korchevin, N.A. AU Rozencveyg, I.B. PY 2025 IS 2025 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»