Application of Modified Nano Alumina as a Solid Phase Extraction Sorbent for the Separation and Preconcentration of Manganese (II) in Milk and Water Samples and its Determination by Flame Atomic Absorption Spectrometry

A simple, selective and efficient solid phase extraction method based on the use of γ-alumina nanoparticles coated with sodium do-decyl 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 absorp-tion 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, en-richment 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 suc-cessfully applied to the determination of manganese (II) in water and milk samples

Keywords:

γ-Alumina nanoparticles , Manganese (II) , Preconcentration , Water and Milk samples , FAAS