[en] The structure of scandium compounds extracted by di-2-ethylhexylphosphoric acid (HDEHP, HA) solutions in CCl₄ and by HDEHP - solid extractant from 0.2-8 M HCl aqueous solutions has been determined. It is shown that from weakly acid (0.2-2 M HCl) and highly acid (6-8 M HCl) solution Sc is extracted by HDEHP solutions mainly in the form of Sc(A₂H)₃ compound, while in 4 M HCl the complex [Sc(A₂H)₂ · (H₂O)₂]⁺Cl^- is formed. At higher concentrations of Sc in the extracts polynuclear complexes are formed. In case of HDEHP -solid extractant Sc is extracted in the form of the complexes [Sc(H₂O)_6-nA_n]^3-n, where n increases monotonously from 0 to 3 with a growth of HCl concentration in aqueous phase. The difference of Sc extraction mechanisms using HDEHP - solid extractant and HDEHP, CCl₄ solutions is explained by peculiarities of extractant state in solid extractant porous matrix