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Preparation of functionalized magnetic nanoparticulate sorbents for rapid extraction of biphenolic pollutants from environmental samples
Authors:Yongsheng Ji  Xiaoyan Liu  Min Guan  Chuande Zhao  Huayu Huang  Haixia Zhang  Chunming Wang
Institution:1. State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, China. Fax: +86-931-8912582

College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, China;2. College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, China

Abstract:A new solid-phase extraction coupled with magnetic carrier technology was developed for extraction of bisphenol A (BPA) and diethylstilbestrol (DES) from water samples. The SPE sorbents, functionalized magnetic nanoparticles (Fe3O4@SiO2/β-CD, core/shell), were synthesized in a two-stage system. The material was characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, and a vibrating sample magnetometer. SPE extraction parameters, such as volume and pH of sample, adsorption time, and desorption conditions were optimized. Under selected conditions: 250 mL of water sample, 0.1 g of sorbents and elution with methanol (3 mL with 1% acetic acid), the extraction was completed in 25 min. SPE followed by HPLC was employed to determine BPA and DES in environmental samples. The developed method provided spiked recoveries of 80–105%, relative standard deviations of less than 7%, and LOD of BPA (20.0 ng/L) and DES (23.0 ng/L), respectively. The proposed method offered easy preparation of sorbents, rapid analysis, high enrichment yields, and reliable quantitative assay.
Keywords:Functionalized magnetic nanoparticles  HPLC  Magnetic isolation  SPE
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