Citation: WANG Ya-Li, YOU Li-Qin, MEI Yu-Wen, LIU Jian-Ping, HE Li-Jun. Benzyl Functionalized Ionic Liquid as New Extraction Solvent of Dispersive Liquid-liquid Microextraction for Enrichment of Organophosphorus Pesticides and Aromatic Compounds[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(6): 942-949. doi: 10.11895/j.issn.0253-3820.151010 shu

Benzyl Functionalized Ionic Liquid as New Extraction Solvent of Dispersive Liquid-liquid Microextraction for Enrichment of Organophosphorus Pesticides and Aromatic Compounds

School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, China

Received Date: 24 December 2015
Revised Date: 7 March 2016

Fund Project: This work was sponsored by the National Natural Science Foundation of China (Nos. 21577031, 20905020), the Plan for Scientific Innovation Talent of Henan Province (No. 124100510005) and the Plan of Nature Science Fundamental Research in Henan University of Technology (No. 2014JCYJ06).

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A benzyl functionalized ionic liquid, 1-benzyl-3-methylimidazolium bis [(trifluoromethyl)sulfonyl]imide ([BeMIM][Tf₂N]), was synthesized and characterized as an extraction solvent of dispersive liquid-liquid microextraction (DLLME) for enrichment and determination of 5 organophosphorus pesticides (phoxim, fenitrothion, chlorpyrifos, phorate and parathion) and 2 aromatic compounds (chloronaphthalene and anthracene) from environmental water samples by high-performance liquid chromatography (HPLC). [BeMIM][Tf₂N] had higher extraction efficiency than 1-octyl-3-methylimidazolium bis [(trifluoromethyl)sulfonyl]imide and common organic solvents such as CCl₄ and C₂Cl₄. The extraction was performed using 40 μL of [BeMIM][Tf2N] and 1 mL of methanol as extraction solvent and dispersive solvent respectively with centrifugal time of 5 min. Under the optimal conditions, the method proposed here provided a good linearity for all analytes with correlation coefficients between 0.9994 and 0.9998. The repeatability values, described as intra-day and inter-day relative standard deviations (RSDs) of five replicate experiments at three different concentrations of 10, 40 and 100 μg/L, were 1.1%-4.3% and 0.8%-4.8%, respectively. The limits of detection (LOD) were 0.01 μg/L-1.0 μg/L at a signal-to-noise ratio (S/N) of 3. This developed method was convenient and speedy, and could be employed to detect the analytes in three real environmental water samples with satisfactory relative recovery of 82.7%-118.3% and RSD of 0.7%-5.6%. Introduction of benzyl group into the imidazolium could obviously enhance the extraction efficiecny for analytes due to the π-π interaction between [BeMIM][Tf₂N] and analytes. [BeMIM][Tf₂N] was a satisfactory extraction solvent with a high enrichment factor of 339 and extraction efficiency of 81.4%. Partition coefficients of all analytes in [BeMIM][Tf₂N]-DLLME system were determined and the extraction mechanism was discussed.
- Benzyl functionalized ionic liquid,
- Dispersive liquid-liquid microextraction,
- Organophosphorus pesticides,
- Aromatic compounds
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