Abstract:

1-Ethylbenzimidazolium(eBim), 1-ethyl-3-butyl-benzimi dazoliumbromine(C4eBimBr) intermediates, and 1-ethyl-3-butyl-enzimidazoliumhexafluorophosphate(C4eBimPF6) 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 μg/L, recoveries of DOP and DNP were 94.3%~102% and 93.5%~103%, respectively.

Key words: Benzimidazole ionic liquid, dispersive liquid-phase microextraction, high performance liquid chromatography, phthalate