A sensitive and selective deep eutectic solvent-based ultrasound-assisted liquid phase microextraction procedure for separation-preconcentration and determination of copper in olive oil and water samples

ABSTRACT

A green and simple deep eutectic solvent-based ultrasound-assisted liquid phase microextraction method has been developed for the preconcentration of copper as 2-(5-bromo-2-pyridylazo)-5-(diethylamino) phenol chelates. The effects of pH, ligand concentration, DES volume, sample volume, and tetrahydrofuran volume were investigated. Analytical performance parameters like limit of detection, limit of quantification, preconcentration factor, and relative standard deviation were determined as 6.6 μg L⁻¹, 21.8 μg L⁻¹, 15, and <5%, respectively. Validation of the developed method was checked by the analysis of certificated reference materials. The procedure was successfully applied to determination of copper in olive oil and water samples.

KEYWORDS:

• Copper
• deep eutectic solvent
• microextraction
• preconcentration
• determination
• 5-Br-PADAP
• olive oil
• water

Acknowledgements

Pertab Menghwar is very much thankful to the Scientific and Technological Research Council of Turkey (TUBITAK). The authors also would like to thank Erciyes University, Kayseri, Turkey, for providing all laboratory facilities and pleasant environment.

Additional information

Funding

This work was supported by the TUBITAK [2216].