Reyhaneh Rahnama - Department of Chemistry, Payame Noor University, Tehran, IRAN
Saideh Fatemeh Shafeii Darabi - رDepartment of Chemistry, Payame Noor University, Tehran, IRAN
Mohammad Reza Jamali - Department of Chemistry, Payame Noor University, Tehran, IRAN

This work presents a fast, feasible and sensitive method forpeconcentration and separation of cobalt in various real samples through use of deep eutectic solvent-based dispersive liquid-liquid microextraction (DES-DLLME); in which deep eutectic solvent, methanol and 1-(2-pyridylazo)-2-naphthole (PAN) were employed as extraction solvent, dispersive solvent and complexing agent, respectively. Co concentration was measured by flame atomic absorption spectrometer. Effective parameters which may influence the extraction efficiencies (like type and volume of dispersive and extraction solvent, pH, PAN concentration, and salt concentration) were examined and optimal values were determined. Use of optimal conditions resulted in the limit of detection equal to 1.5 μg L-1 with a preconcentration factor of 40. RSD value after measuring 20.0 μg L-1 of cobalt for 10 times, resulted in value of 3.0 %. The method accuracy and applicability were assessed through evaluation of Co content in water certified reference materials and different water specimen.

Deep eutectic solvent based dispersive liquid-liquid microextraction, 1-(2-pyridylazo)-2-naphthole, cobalt, water samples