Reyhaneh Rahnama; Saideh Fatemeh Shafeii Darabi; Mohammad Reza Jamali
Abstract
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 1-(2-pyridylazo)-2-naphthole ...
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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 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 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 1.5 μg/L with a preconcentration factor of 40. RSD value, after measuring 20.0 μg/L of cobalt for 10 times, resulted in a value of 3.0 %. 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.
Mohammad Reza Jamali; Aysanam Kazemi
Volume 1, Issue 1 , March 2014, , Pages 36-43
Abstract
A simple, selective and efficient solid phase extraction method based on the use of γ-alumina nanoparticles coated with sodium dodecyl sulfate (SDS) and modified with 2-(5-Bromo-2-pyridylazo)-5-(diethylamino) phenol (5-Br-PADAP) as a new adsorbent was developed for ...
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A simple, selective and efficient solid phase extraction method based on the use of γ-alumina nanoparticles coated with sodium dodecyl sulfate (SDS) and modified with 2-(5-Bromo-2-pyridylazo)-5-(diethylamino) phenol (5-Br-PADAP) as a new adsorbent was developed for the separation and preconcentration of trace amounts of manganese (II) prior to determination by flame atomic absorption spectrometry. Analytical influencing parameters including pH value, amount of modified sorbent, equilibrium time, volume and concentration of eluent were examined. Under the optimum conditions, adsorption capacity of nano- Al2O3-SDS-5-Br-PADAP, enrichment factor and limit of detection for manganese (II) was 18.5 mg g -1, 25 and 0.9 µg L -1, respectively. The procedure was successfully applied to the determination of manganese (II) in water and milk samples.
