2, 4-Dinitroso-1-Hydroxy-9-Aminonaphthalene-6, 8-Disulfonic Acid as a Sensitive Reagent for Yttrium Ions

Abstract

A simple and express spectrophotometric method for the determination of yttrium with a new organic reagent 2,4-dinitroso-1-hydroxy-9-amino-naphthalene-6,8-disulfonic acid has been developed. The maximum light absorption of the reagent (λHR = 540) and its complex (λ_MeR = 650 nm) was found.Their structure was studied by IR spectroscopy. The molar ratios of the complex were studied by the Asmus method. The formation and stability of the Y3 + complex with 2,4-dinitroso-1-hydroxy-9-amino-naphthalene-6,8-disulfonic acid was studied by spectrophotometric determination in an aqueous medium. The dissociation constants of the ligand were also studied in an aqueous solution. Spectrophotometric data showed that the metal content in all complexes corresponds to a stoichiometry of 1: 1 = metal: ligand. The formation spectra were used to determine the stability constants of chelates and to determine the optimal pH conditions for obtaining complexes. The developed methods were applied to determine yttrium in the composition of ores.