期刊
MICROCHIMICA ACTA
卷 179, 期 3-4, 页码 257-264出版社
SPRINGER WIEN
DOI: 10.1007/s00604-012-0894-2
关键词
Hydroxyl-terminated polydimethylsiloxane; Hydroxyl-terminated multi-walled carbon nanotubes; Magnetic solid-phase extraction; Fluoroquinolones; Capillary liquid chromatography
资金
- National Natural Science Foundation of China [21075044, 21175048]
We have surface-functionalized magnetic particles (MPs) with polydimethylsiloxane and multi-walled carbon nanotubes in a two-step reaction. The MPs were applied to solid-phase extraction of the fluoroquinolones ofloxacin, norfloxacin, ciprofloxacin, enrofloxacin prior to their determination by capillary liquid chromatography. The effects of sample pH, adsorption time, type of eluent, desorption time and desorption temperature were investigated. Under the optimum conditions, the extraction efficiencies are in the range from 81.5 % to 94.1 %, with relative standard deviations (RSDs) of < 7.6 %. The detection limits vary from 0.24 to 0.48 ng mL(-1). The method was applied to the analysis of spiked mineral water and honey. The recoveries for the fluoroquinolones in the real samples range from 84.0 % to 112 %, with RSDs ranging from 2.9 % to 7.8 %.
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