Ligandless reversed-phase switchable-hydrophilicity solvent liquid-liquid microextraction combined with flame-atomic absorption spectrometry for the determination of copper in oil samples

Hassan M., Erbas Z., Alshana U., SOYLAK M.

MICROCHEMICAL JOURNAL, vol.156, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 156
  • Publication Date: 2020
  • Doi Number: 10.1016/j.microc.2020.104868
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, BIOSIS, CAB Abstracts, Chemical Abstracts Core, Chimica, Food Science & Technology Abstracts, Index Islamicus, Veterinary Science Database
  • Keywords: Copper, Flame-atomic absorption spectrometry, Liquid-liquid microextraction, Oil, Switchable-hydrophilicity solvent, SLOTTED QUARTZ TUBE, MULTIVARIATE OPTIMIZATION, HPLC DETERMINATION, MASS-SPECTROMETRY, VEGETABLE-OILS, OLIVE OIL, PRECONCENTRATION, WATER, SEPARATION, NICKEL
  • Erciyes University Affiliated: Yes


A novel ligandless reversed-phase switchable-hydrophilicity solvent liquid-liquid microextraction method is proposed for the determination of copper in oil samples using flame-atomic absorption spectrometry. Optimum extraction conditions were achieved using 500 mu L of triethylamine as the extraction solvent, 750 mu L of 7.5 M nitric acid as a hydrophilicity-switching trigger, 30 mL of the oil sample and 5 min extraction time. Limits of detection and quantitation were found as 6.9 and 23.0 ng mL(-1), respectively. Good linearity was obtained with a coefficient of determination (R-2) value of 0.9998 and a preconcentration factor of 22.7. Intraday and interday precision, expressed as percentage relative standard deviations (%RSD), were less than 4.7 and 9.4%, respectively. Accuracy was checked by addition-recovery studies and percentage recoveries within the range of 85-100% were obtained. The proposed method was successfully applied to determine copper ion in edible oil samples (i.e., sunflower, olive, flaxseed and corn) and baby oil and satisfactory results were achieved.