新型对称性1,3-二己基咪唑离子液体分散液液微萃取多环芳烃研究

Enrichment of Polycyclic Aromatic Hydrocarbons by Dispersive Liquid-Liquid Microextraction Using New Symmetrical 1,3-Dihexylimidazolium Based Ionic Liquid as Extraction Solvent

合成并表征了一种新的对称性1,3-二己咪唑双三氟甲烷磺酰亚胺（1,3-Dihexylimidazolium bis（trifhoromethyl） sulfonyl imide,HHIMTf2N）离子液体,将其作为分散液液微萃取的萃取剂,并与高效液相色谱联用,建立了一种快速、绿色和高灵敏测定环境水样中4种多环芳烃（氯代萘、芴、蒽和苊）的方法.对比了HHIM Tf2N与其它萃取剂的效果,优化了萃取剂的体积、分散剂的种类和体积、盐浓度、萃取及离心时间.在优化实验条件下对该方法进行评价。

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 （PAils） 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 stand- ard 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%.