Magnetic Porous Ion Imprinted Polymer Based on Surface Polymerization and Nano-ZnO as Sacrificial Support for Selective Extraction and determination of Pb (II) in Water Samples and Cosmetics

A selective porous ion imprinted polymer (IIP) coated on Fe 3 O 4 @SiO 2 nanocomposite as the adsorbent combined with electrothermal atomic absorption spectrometry (ETAAS) was applied for preconcentration and determination of lead ion in real samples including water samples, and cosmetics. The IIP was synthesized using styrene as a functional monomer in the presence of Pb (II) ions as the main template and ZnO nanoparticles as the sacrificial template, which were co-imprinted. The synthesized nanocomposites were characterized by FTIR, VSM, XRD, and scanning electron microscope (SEM) analysis. The Plackett Burman design (PBD) of experiments was used to screen the relative importance of the variables such as the amount of sorbent, pH, monomer to template ratio, polymerization time, extraction time, and some other factors. In the following, the optimization process was carried out using the central compound design (CCD). A calibration curve was constructed and a regression equation was intended. The limit of detection (LOD) and limit of quantification (LOQ) were 0.0002 and 0.0007μg L −1 respectively. A dynamic linear range (DLR) of 0.0007–100 μg L −1 was found with the correlation coefficient ( R 2 ) of 0.9978. Reproducibility was obtained with a relative standard deviation (RSD) value of 6.8%. The method was applied for the determination of trace Pb (II) in the real samples, like the drinking water, wastewater, as well as nail polish and lipstick from the category of cosmetics with relative recoveries of 90.069–109.014%.