Department of Analytical Chemistry, University of Córdoba, Campus de Rabanales, E-14071 Córdoba, Spain.
Talanta. 2012 Jan 30;89:124-8. doi: 10.1016/j.talanta.2011.11.080. Epub 2011 Dec 7.
This paper reports for the first time the use of microextraction by packed sorbents in combination with Capillary electrophoresis (CE) for carry out the preconcentration and determination of three characteristics cations of ionic liquids in river water. Before analysis a carbon nanotubes modified filter was used to remove potential organic interferences from the samples. The system was automated by connecting the syringe-microextraction by packed sorbents (MEPS) assembly to a syringe pump and interfacing it to a computer. After preconcentration, analytes were determined by NACE. The limits of quantification of analytes were of 0.02 mg L(-1) from only 5 mL of sample with an RSD of less than 7%. The values of recovery range between 85 and 97%.
本文首次报道了采用填充固相微萃取与毛细管电泳联用技术，对河水样品中三种特征的离子液体阳离子进行预浓缩和测定。在分析之前，采用碳纳米管修饰的过滤器从样品中去除潜在的有机干扰物。通过将注射器-填充固相微萃取（MEPS）组件与注射器泵连接，并将其与计算机接口，实现了系统的自动化。预浓缩后，采用 NACE 法测定分析物。通过仅 5 毫升的样品，分析物的检出限为 0.02 毫克/升，相对标准偏差小于 7%。回收率在 85%至 97%之间。
