Complexation of scandium 2-hydroxy-5-T-butylphenol-4¢-metoxyazobenzene (HR) was studied by atomic-absorption and spectrophotometric methods. Optimum conditions of formation and extraction of the complex were found. Maximum light absorbance of a complex in n-butanol is in the range of 470÷480 nm.  Molar absorption coefficient equals to (2.2–3.0)^.10⁴_.  Stability constant of scandium in n-butanol is b_л=2.8·10¹⁰. Selective and sensitive techniques of extraction-atomic absorption determination of scandium in soils were developed

doi.org/10.32737/0005-2531-2021-4-49-52