title: Dispersive liquid-liquid microextraction based on solidification of floating organic drop for preconcentration and determination of trace amounts of copper by flame atomic absorption spectrometry.
abstract: A novel, simple, rapid, sensitive, inexpensive and environmentally friendly dispersive liquid-liquid microextraction method based on the solidification of a floating organic drop (DLLME-SFO) was developed for the determination of copper by flame atomic absorption spectrometry (FAAS). N-o-Vanillidine-2-amino-p-cresol was used as a chelating ligand and 1-undecanol was selected as an extraction solvent. The main parameters affecting the performance of DLLME-SFO, such as sample pH, volume of extraction solvent, extraction time, concentration of the chelating ligand, salt effect, centrifugation time and sample volume were investigated and optimized. The effect of interfering ions on the recovery of copper was also examined. Under the optimum conditions, the detection limit (3σ) was 0.93μgL-1for Cu using a sample volume of 20mL, yielding a preconcentration factor of 20. The proposed method was successfully applied to the determination of Cu in tap, river and seawater, rice flour and black tea samples as well as certified reference materials.
authors.affiliation: Department of Chemistry, Art and Science Faculty, Balıkesir University, 10100 Balıkesir, Turkey. Electronic address: karadas@balikesir.edu.tr.
authors.forename: Cennet
authors.initials: C
authors.lastname: Karadaş
authors.affiliation: Department of Chemistry, Art and Science Faculty, Balıkesir University, 10100 Balıkesir, Turkey.
authors.forename: Derya
authors.initials: D
authors.lastname: Kara
mesh_terms: D001547:Benzaldehydes / Q000737:chemistry; D002614:Chelating Agents / Q000737:chemistry; D003300:Copper / Q000032:analysis*; D003408:Cresols / Q000737:chemistry; D060766:Drinking Water / Q000737:chemistry; D005433:Flour / Q000032:analysis; D005504:Food Analysis; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D059627:Liquid Phase Microextraction / Q000379:methods*; D012275:Oryza / Q000737:chemistry; D045483:Rivers / Q000737:chemistry; D012623:Seawater / Q000737:chemistry; D013054:Spectrophotometry, Atomic; D013662:Tea / Q000737:chemistry
chemical_list: D001547:Benzaldehydes; D002614:Chelating Agents; D003408:Cresols; D060766:Drinking Water; C525672:N-o-vanillidine-2-amino-p-cresol; D013662:Tea; D003300:Copper
keywords: Copper; Dispersive liquid–liquid microextraction; N-o-Vanillidine-2-amino-p-cresol; Rice flour; Solidification of floating organic drop; Water