Dispersive liquid–liquid microextraction based on green type solvents—"deep eutectic solvents"—for highly selective separation and efficient preconcentration of nickel in water samples.

Rad, Ali Shokuhi; Rahnama, Reyhaneh; Zakeri, Motahare; Jamali, Mohammad Reza

This study proposed a fast, feasible, and sensitive method for nickel preconcentration and separation in different actual samples through the use of deep eutectic solvent based dispersive liquid–liquid microextraction (DES-DLLME). This method involves dissolving a suitable extraction solvent in a dispersive solvent and its rapid syringing into water sample to obtain a turbid solution. Phase separation could be then carried out by centrifugation and the analyte can be determined. 2,2′-furildioxime was employed as the chelating agent through formation of a hydrophobic complex with nickel. To reach maximum recovery, some variables including type and volume of dispersive solvent, volume of extraction solvent, pH, 2,2′-furildioxime concentration, and salt concentration were optimized. Under optimal conditions, nickel calibration graph was linear in the range of 5.0–100 µg L−1. The detection limit and preconcentration factor were obtained as 1.7 µg L−1 and 40 µg L−1, respectively. Finally, this method was successfully applied for the extraction and determination of nickel in water samples with a relative recovery of 98.8–101.0%.

EUTECTICS; EUTECTIC reactions; WATER sampling; NICKEL; SOLVENTS; SOLVENT extraction; CHELATING agents

Journal of the Iranian Chemical Society, 2019, Vol 16, Issue 8, p1715

1735-207X

Academic Journal

10.1007/s13738-019-01643-0