%0 Journal Article %T %A , .. %A , .. %K экстракт, опилки коры дуба, листья дуба, ионы железа (III), очистка, extract, sawdust oak bark, leaves of oak, ions of iron (III), purification %J Herald of Technological University %D 2025 %N 16 %P 2 %I Kazan National Research Technological University