Univariate and multivariate optimization of spectrophotometric determination of europium (III)‎ in pure form and synthetic sample

Abstract EN

Two different approaches, univariate and multivariate (simplex method), have been used to obtain the optimum conditions for the quantitative Spectrophotometric determination of Eu3+ using Solochrome violet RS (3-Hydroxy-4-(2-hydroxy phenyl azo) naphthalene -1-sulfonic acid) (SVRS) as a chromogenic reagent.

The investigation shows that Eu3+ ion forms a wine-red complex with SVRS in alkaline buffer solution having a maximum absorbance at 464 nm against reagent blank.

Calibration graphs obtained under univariate and simplex were found to be linear in the range of (0.30-8.0) μg / ml with detection limit 0.061 μg / ml and molar absorptivity of 9877.66 L / mol.cm and (0.40-10.0) μg / ml with detection limit 0.055 μg / ml and molar absorptivity of 10759.05 L/mol.cm respectively.

The stoichiometric composition of the formed Eu-SVRS chelate complex is 1 : 4 (Metal:Ligand).

Effect of the presence of some metal ions as interferences was studied and the method has been applied successfully to the determination of cited ion in synthetic sample.