Xiaojia Huang, Yulei Wang, Yi Liu, Dongxing Yuan.Journal of Separation Science,2013. 36: 3210–3219

Nanosized spherical magnetic poly(vinylimidazole-co-divinylbenzene) particles were synthesizedand used as a sorbent for the enrichment of trace fluoroquinolones (FQs) fromenvironmental water samples. A suspension polymerization procedure was used to preparethe sorbent. The magnetic sorbent was characterized by SEM, transmission electronmicroscopy, elemental analysis, and FTIR spectroscopy. Analysis of enrofloxacin, marbofloxacin,fleroxacin, lomefloxacin, and sparfloxacin in environmental water samples bythe combination of the magnetic sorbent and HPLC with diode array detection was selectedas a paradigm for the practical application of the new adsorbent. Several extractionconditions, including desorption solvent, extraction and desorption time, pH value, andionic strength in sample matrix, were optimized. Results showed that the new sorbent hadhigh affinity for FQs and could be used to extract them effectively. Under the optimumconditions, low detection (S/N = 3) and quantification (S/N = 10) limits were achieved forthe target analytes, within the ranges of 0.20–1.46 and 0.68–4.84 _g/L, respectively. Methodrepeatability was achieved in terms of intra- and interday precisions, indicated by the RSDs,which were both <10 .0%. the method also showed good linearity, simplicity, practicality,and environmental friendliness for the extraction of fqs. finally, the developed method wassuccessfully applied to the determination of fqs in lake water, surface water, and reservoirwater samples. acceptable recoveries of spiked target compounds in these water sampleswere in the range of 52.1–104.5%.