Sineltsev Aleksey Andreevich RussiaSaratovSaratov State Polytechnical University named after Gagarin Yu. A., 410054, Saratov, Polytechnical str., 77aleksej-sinelcev@yandex.ru Author's articles Adsorption of Fe2+, Mn2+, Cu2+, Cd2+ Cations Using Granular Glauconite Sorbents