Journal
JOURNAL OF SEPARATION SCIENCE
Volume 32, Issue 12, Pages 2139-2145Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.200900018
Keywords
Functionalized magnetic nanoparticles; HPLC; Magnetic isolation; SPE
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Funding
- National Natural Science Foundation of China (NSFC) Fund [20775029]
- New Century Excellent Talents in University [NCET-07-0400]
- Central Teacher Plan in Lanzhou University
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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/beta-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.
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