标题：New magnetic solid phase extractor based on ionic liquid modified β-cyclodextrin polymer/Fe3O4 nanocomposites for selective separation and determination of linuron
摘要：Abstract Background Direct determination of trace analyte, in particular at ultra-trace concentration, cannot be easily achieved in complex systems by UV-visible spectrometry because of the lack of sensitivity and selectivity of the method. Therefore, an efficient separation step is often required prior to the determination. In accordance, a new magnetic solid phase extractor based on ionic liquid modified carboxymethyl-hydroxypropyl-β-cyclodextrin polymer magnetic particles Fe3O4 functionalized with ionic liquid (IL-CM-HP-β-CDCP magnetic nanoparticles (MNPs)) was developed for a selective separation of linuron prior to its determination by UV-visible spectrometry. Methods Ionic liquid modified carboxymethyl-hydroxypropyl-β-cyclodextrin polymer magnetic particles Fe3O4 (Fe3O4@IL-CM-HP-β-CDCP) were confirmed by Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray powder diffraction (XRD). The uptake behavior of the new Fe3O4@IL-CM-HP-β-CDCP MNPs adsorbent toward linuron was studied. The concentrations of linuron were directly determined after reading absorbance by UV-visible spectrometry. Results Fourier transform infrared spectroscopy, scanning electron microscopy, and XRD results strongly confirmed the formation of Fe3O4@IL-CM-HP-β-CDCP MNPs phase. Adsorption study revealed the Fe3O4@IL-CM-HP-β-CDCP MNPs for a selective separation of linuron prior to its determination by UV-visible spectrometry. The results showed that linuron was adsorbed rapidly on Fe3O4@IL-CM-HP-β-CDCP MNPs and eluted by 4.0 mL ethanol in 15 min. Under the optimized conditions, the linear calibration curves for linuron were obtained over the concentration range of 0.07–19.00 μg mL−1 with a relative standard deviation of 1.97 % (n = 3, c = 4.00 μg mL−1). The detection limits, the limit of quantification, correlation coefficient (R), and preconcentration factor were 7.0 μg L−1, 70.0 μg L−1, 0.9987, and 15, respectively. Conclusions Ultimately, the developed method can be applied and effectively utilized for the determination of linuron in real samples.
