Reyhaneh Rahnama - Department of Chemistry, Payame Noor University, P.O. Box ۱۹۳۹۵-۴۶۹۷, Tehran, Iran
Saideh Fatemeh Shafeii Darabi - Department of Chemistry, Payame Noor University, P.O. Box ۱۹۳۹۵-۴۶۹۷, Tehran, Iran
Mohammad Reza Jamali - Department of Chemistry, Payame Noor University, P.O. Box ۱۹۳۹۵-۴۶۹۷, Tehran, Iran

This work presents a fast, feasible, and sensitive method for the preconcentration and separation of cobalt in various real samples through the use of deep eutectic solvent-based dispersive liquid-liquid microextraction (DES-DLLME) in which deep eutectic solvent, methanol, and ۱-(۲-pyridylazo)-۲-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 the dispersive and extraction solvent, pH, PAN concentration, and salt concentration) were examined and the optimal values were determined. The use of optimal conditions resulted in a limit of detection equal to ۱.۵ μg/L with a preconcentration factor of ۴۰. RSD value, after measuring ۲۰.۰ μg/L of cobalt for ۱۰ times, resulted in a value of ۳.۰ %. The methodʼ s accuracy and applicability were assessed through the evaluation of Co content in water certified reference materials and different agricultural and water specimen.

Deep eutectic solvent based dispersive liquid-liquid microextraction, ۱-(۲-pyridylazo)-۲-naphthole, Cobalt, Water Samples, agricultural products