Multi-factor optimization and application of orbital shaker assisted dispersive magnetic solid phase microextraction of silver in various food samples

Abstract

An orbital shaker assisted dispersive magnetic solid phase microextraction (OSA - dMSPµE) method was developed for the determination of silver in food samples using flame atomic absorption spectrometry (F AAS). New cross-linked polylinoleic acid-polystyrene- polydimethylsiloxane graft copolymer (PLinaS-PDMS) was synthesized and used as an adsorbent encapsulated with magnetic Fe₃O₄ nanoparticles. The adsorbent was characterized by FT-IR NMR, DSC, SEM-EDX, BET techniques. Adsorbent capacity was also determined as 34.8 mg g⁻¹. Multi-factor optimization of the OSA - dMSPµE method was performed. The limit of detection (LOD) and limit of quantification (LOQ) were 0.4 µg L⁻¹ and 1.2 µg L⁻¹, respectively. The linearity was 1.2–112 µg L⁻¹. Relative standard deviation percentage (RSD%) for intraday and interday was found to be 3.2 % and 5.7 %, respectively using 100 µg L⁻¹ Ag solution. The preconcentration factor was determined as 125. The method was applied to certified reference material, t test was used and quantitative results (94 %) were obtained.