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Selectivity silica gel with covalently linked thiosemicarbazide relative to the mixture Cu (II), Co (II), Cd (II), Ni (II), Zn (II). sorpchrom [Internet]. 2018 Feb. 20 [cited 2026 Apr. 4];17(1):94-101. Available from: https://journals.vsu.ru/sorpchrom/article/view/357