Laboratory of Analytical Chemistry, Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece.
Department of Chemistry, Iowa State University, Ames, IA, 50010 United States.
J Chromatogr A. 2018 Oct 12;1571:47-54. doi: 10.1016/j.chroma.2018.08.013. Epub 2018 Aug 7.
In this study, an enhanced variant of magnetic ionic liquid (MIL)-based dispersive liquid-liquid microextraction is put forward. The procedure combines a water insoluble solid support and the [P][Dy(III)(hfacac)] MIL, in a one-pot, pH-modulated procedure for microextraction of triazines (TZs) and sulfonamides (SAs). The solid supporting material was mixed with the MIL to overcome difficulties concerning the weighing of MIL and to control the uniform dispersion of the MIL, rendering the whole extraction procedure more reproducible. The pH-modulation during extraction step makes possible the one-pot extraction of SAs and TZs, from a single sample, in 15 min. Overall, the new analytical method developed enjoys the benefits of sensitivity (limits of quantification: 0.034-0.091 μg L) and precision (relative standard deviation: 5.2-8.1%), while good recoveries (i.e., 89-101%) were achieved from lake water and effluent from a municipal wastewater treatment plant. Owing to all of the above, the new procedure can be used to determine the concentrations of SAs and TZs at levels below the maximum residue limits.
在本研究中，提出了一种基于磁性离子液体（MIL）的改进型分散液液微萃取方法。该方法在 pH 调节的一步法中，将不溶于水的固体载体与 [P][Dy(III)(hfacac)]MIL 结合，用于三嗪（TZs）和磺胺类（SAs）的微萃取。固体支撑材料与 MIL 混合，克服了 MIL 称重和控制 MIL 均匀分散的困难，使整个萃取过程更具重现性。萃取过程中的 pH 调节使得可以从单个样品中在 15 分钟内同时萃取 SAs 和 TZs。总的来说，所开发的新分析方法具有灵敏度高（定量限：0.034-0.091μg L）和精密度好（相对标准偏差：5.2-8.1%）的优点，并且从湖泊水中和城市污水处理厂的废水中获得了良好的回收率（即 89-101%）。由于所有这些优点，该新方法可用于测定低于最大残留限量的 SAs 和 TZs 的浓度。
