Extraction, pre-concenturation of lead in various water and food samples by orbit shaker-assisted magnetic solid phase extraction method using a new magnetic polylinoleic acid-polystyrene-pdms block copolymer with flame atomic absorption spectrometter determination

The aim of this study is to develop a practical orbital shaker-assisted dispersive magnetic solid phase extraction (OSA-MSPE) method for the determination of lead by flame atomic absorption spectrometry (FAAS). A new magnetic PSt-PLina-PDMS hydrophobic graft copolymer was synthesized, characterized by NMR, FT-IR, SEM-EDX, DSC, TGA, BET analyses, and magnetic nanocomposite adsorbent was produced by coating with iron oxide nanoparticles for the extraction of Pb (II). Various analytical parameters such as pH, amount of adsorbent, sample volume, shaking time, etc. were optimized. Design of experiment was used to examine different parameters. The linear range at the optimum operating condition was 1.7–84 µg L−1. The detection limit (LOD) and limit of quantification (LOQ) were 0.5 µg L−1, 1.7 µg L−1, respectively. Intraday and interday relative standard deviation (RSD%), enhancement factor (EF) and adsorbent capacity were found to be 1.9%, 3.3%, 166.7, 50 mg g-1, respectively. The OSA-MSPE method was tested for accuracy with certified reference materials celery (NCS ZC73032), mushroom powder (CS-M-3) and LGC-6010 (Hard drinking water). The developed method was successfully applied to various liquid and solid food samples. It was concluded that the developed OSA-MSPE method has some important features such as selective, sensitive, low LOD, LOQ and RSD, high preconcentration factor (PF) and enhancement factor (EF).