Enrichment of Polycyclic Aromatic Hydrocarbons by Dispersive Liquid-Liquid Microextraction Using New Symmetrical 1,3-Dihexylimidazolium Based Ionic Liquid as Extraction Solvent
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KeyWord:1,3-dihexylimidazolium bis[(trifluoromethyl)sulfonyl]imide ionic liquid  dispersive liquid-liquid microextraction  high-performance liquid chromatography(HPLC)  polycyclic aromatic hydrocarbons
郑小焱,何丽君*,张凯歌,江秀明,向国强,刘建平 河南工业大学化学化工学院
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      A new symmetrical 1,3-dihexylimidazolium bis[(trifluoromethyl)sulfonyl]imide([HHIM][Tf2N]) was synthesized and characterized,and was for the first time employed as extraction solvent in dispersive liquid-liquid microextraction(DLLME) for enrichment and determination of four polycyclic aromatic hydrocarbons(PAHs) including chloronaphthalene,fluorene,anthracene and chrysene in environmental water sample by high-performance liquid chromatography(HPLC).The extraction conditions influencing extraction efficiency,such as kind of extraction and disperser solvent,volume of extraction and disperser solvent,salt concentration,extraction and centrifugal time were investigated in detailed.Under the optimal conditions,the proposed method provided good linearities for all analytes with correlation coefficients(r2) of 0.999 0- 0.999 8.The relative standard deviations(RSDs,n=5) for four analytes varied between 1.5% and 5.0%.The limits of detection for the method(S/N=3) ranged from 0.002 5 μg?L-1 to 1.0 μg?L-1 and the enrichment factors were in the range of 183-372.This developed method was convenient,speedy,highly sensitive,environment friendly,and was successfully applied in the detection of 4 real water samples(e.g.tap water,ground water,rain water and river water) with recoveries of 84.7%-115.2% and RSDs of 1.6%-6.4%.