Preconcentration of Gadolinium Ion by Solidification of Floating Organic Drop Microextraction and Its Determination by UV-Vis Spectrophotometry

Abstract

A solidified floating organic drop microextraction (SFODME) combined with UV-Vis
spectrophotometry was applied for preconcentration and determination of Gd(III). In
this study, Morin (3, 5, 7. 2’, 4’ pentahydroxy flavone) as a suitable ligand and 1-
Dodecanol as extraction solvent were used. Following the extraction Gd-Morin
complex, the extraction solvent was transported to a spectrophotometer for
determination of Gadolinium ion at the absorption wave length of 440 nm. The main
affecting factors in the performance of SFODME such as pH, concentration of Morin,
extraction time, stirring rate and sample volume were investigated and optimized.
Under the optimum conditions, the enrichment factor of 23, linear dynamic range of
80-900 µg L-1 with correlation of determination (R2>% 99) and limit of detection of
172µg L-1 were obtained for determination of Gd(III). The relative standard deviation (n
= 5) for 150 µg L−1 of Gd(III) (sample volume 4.0mL) was ±2.17%. The method was
successfully applied for preconcentration and determination of Gd(III) in water samples.