The Study On Dispersive Liquid-liquid Microextraction Based On Hydroxy And Benzyl Fuctionized Ionic Liquids

The paperdescribed the synthesis, characterization of hydroxyl and benzylfunctionalization ionic liquids as were as their extraction perfprmance as extraction solent indispersive liquid-liquid microextraction（DLLME）. Some parameters influencingmicroextraction procedure, such as the type and volume of extraction and dispersive solvent,the extraction and centrifuging time, the salt effect, and sample solution pH and temperature,were investigated and optimized.A method based on functionalized ionic liquid1-（1′-hydroxy）-hexyl-3-butylimidazoliumhexafluorophosphate （[HhyBIM][PF6]）-DLLME, was developed for the determination oforganic pollutants in waters using HPLC. Under the optimized condition, the enrichmentfactors（EF） and extraction recoveries（ER） are in the range of225-456and40.8%-84.2%,respectively. The limits of detection（LOD）were0.0006μg/L-0.06μg/L at a signal-to-noiseratio （S/N） of3. The relative standard deviations varied between1.4%and5.2%（n=5）.An efficient DLLME technique using functional ionic liquid1-benzyl-3-methylimidazolium bis [（trifluoromethyl）sulfonyl]imide （[BeMIM][Tf2N]） asextraction solvent had been developed for determination of organic pollutants in watersamples using HPLC. Under the optimized condition, EF and ER were in the range of282-365and61.2%-81.4%, respectively. The limits of detection（LOD）were0.0005μg/L-1μg/L at a signal-to-noise ratio （S/N） of3. The relative standard deviations were0.5%to5.7%（n=5）.Determination of aromatic hydrocarbons （PAHs） in water samples was investigated byusing DLLME, in which1-benzyl-3-octylimidazolium bis [（trifluoromethyl）sulfonyl]imide（[BeOIM][Tf2N]） was used as extraction solvent, and HPLC. Under the optimized conditions,EF was in the range of324-418, and satisfied ER （61.2%-79.9%） were obtained. The LOD is0.0001-0.01μg/L. The method was proven of good precision and high sensitivity.A novel microextraction method was introduced based on DLLME in which an in situmetathesis reaction formed a waterimmiscible ionic liquid （[HhyBIM]Cl+KPF₆） thatpreconcentrates phenols from water. Several important parameters influencing the[HhyBIM]Cl-DLLME extraction efficiency such as the volume of extraction solvent, themolar ration of [HhyBIM]Cl and KPF₆, extraction time and centrifugal time were investigated.Under the optimized conditions, good enrichment factors （94-196） and accepted recoveries （41.3%-86.4%） were obtained for the extraction of the target analytes in water samples.Coefficients of correlation （r2） ranged from0.9992-0.9996. The LODs were0.01-0.1μg/L at asignal-to-noise ratio （S/N） of3. The results showed the developed [HhyBIM]Cl-DLLMEprocedure possessed greater capability of enriching polar analytes due to its in-situ extractphase, which assisted in the achievement of a more efficient separation of phenols.