Magnetic solid phase extraction of lead(II) from food and water samples on magnetic MWCNTs/MgAl2O4/TiO2

A magnetic MWCNTs@MgAl2O4@TiO2 novel nanocomposite was synthesized using the sol-gel method. The characterization of synthesized nanocomposite was done using FTIR, XRD, and SEM techniques. The adsorbent was used for dispersive solid-phase extraction of Pb(II). The analytical parameters that affect the extraction recovery of the analyte were optimized, involving the pH, adsorbent amount, sample volume, and interfering ions. The figures of merit such as preconcentration factor (PF), the limit of detection (LOD), the limit of quantification (LOQ), correlation coefficient (R2) and relative standard deviation (RSD) of Pb(II) are 100, 0.42 mu g L-1, 1.39 mu g L-1, 0.996 % and 4.1 % respectively. TMDA 64.3 fortified lake water and NCS DC 73349 bush, branches and leaves certified reference materials were used to validate the presented procedure. The synthesized adsorbent was used for separation-preconcentration and determination Pb(II) from water and food samples prior to its determination by FAAS.