Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 409, Issue 5, Pages 1165-1172Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-016-0087-7
Keywords
Bisphenol A; Magnetic reduced graphene oxide; Solid-phase extraction; Dispersive liquid-liquid microextraction; Gas chromatography-mass spectrometry; Environmental water
Funding
- National Natural Science Foundation of China [41272262]
- Science and Technology Planning Project of Guangdong Province, China [2016A040403112]
- Major Projects (Natural Science) of Education Department of Guangdong Province, China [261555101]
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Bisphenol A (BPA), an endocrine-disrupting chemical, has received much attention from researchers and the general public. In this paper, a novel method of determining BPA at trace levels was developed, using magnetic reduced graphene oxide (rGO-Fe3O4)-based solid-phase extraction coupled with dispersive liquid-liquid microextraction (DLLME), followed by high-performance liquid chromatographic determination. The rGO-Fe3O4 was prepared and then characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, and vibrating sample magnetometry. The greatest saturation magnetization of rGO-Fe3O4 was up to 43.8 emu g(-1), which allowed rapid isolation of the rGO-Fe3O4 from solutions upon applying an appropriate magnetic field. The effects of solution pH, adsorbent amount, type and volume of eluent and extraction solvent, extraction time, and salt concentration on the extraction efficiency of BPA were examined and optimized. Under the optimum conditions, an enrichment factor of 5217 and an LOD of 0.01 mu g L-1 for BPA were obtained. The reusability of rGO-Fe3O4 for at least 12 repeated cycles without any significant decrease in the extraction recovery of BPA was demonstrated. The proposed method was applied to the determination of BPA in different real water samples, with relative recoveries of 84.8-104.9 % and RSDs of 0.8-8.3 % in the spiked concentration range 1-10 mu g L-1.
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