1-Ethylbenzimidazolium ( eBim ) , l-ethyl-3-butyl-benzimi dazoliumbromine ( C4eBimBr ) intermediates, and l-ethyl-3-butyl-benzimidazoliumhexafluorophosphate ( C4 eBimPF6 ) ionic liquid were synthesized. The structures of the intermediates and the ionic liquid were analyzed with IR and nuclear magnetic resonance spectroscopies. An analytical method for the determination of dioctyl phthalate( DOP) and dinonyl phthalate( DIP) in water using ionic liquid-based microextraction coupled with high performance liquid chromatography was developed. The influence of the extraction parameters including the extraction temperature, extraction time, and amount of ionic liquid was investigated. In the range from 1.0 ~ 10 μg/L, the relationship between the peak height and concentration of DOP and DNP was linear, and the correlative coefficients were 0. 9847 and 0. 9872 respectively. The limits of detection of the DOP and DNP were 0. 018 and 0. 052 ug/L, recoveries of DOP and DNP were 94. 3% - 102% and 93. 5% ~ 103% , respectively.%合成了 1-乙基苯并咪唑(eBim)、1-乙基-3-丁基苯并咪唑溴(C4eBimBr)中间体和1-乙基-3-丁基苯并咪唑六氟化磷(C4eBimPF6)离子液体.通过红外光谱和核磁共振波谱表征了各步反应产物的结构.基于离子液体分散液相微萃取-高效液相色谱法分析了水中邻苯二甲酸辛酯(DOP)和邻苯二甲酸壬酯(DNP).考察了萃取温度、萃取时间和离子液体用量对DOP和DNP萃取效果的影响.在1.0～10 μg/L范围内,DOP和DNP的色谱峰高与质量浓度分别呈线性关系,相关系数(r2)分别为0.984 7和0.987 2.DOP和DNP的最低检出限分别为0.018和0.052 μg/L,加标回收率分别为94.3％ ～ 102％和93.5％～103％.
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