Ion Mobility Detection After Supercritical Fluid Extraction

带电粒子在粘性介质中的运动在电场的影响下以不同的速度运动，这取决于电场与介质阻力竞争所产生的加速度。一种测量不同离子相对运动速度的装置是离子迁移率光谱仪。在化学系分析和表面化学计划的支持下，McMinn教授将使用离子迁移率光谱仪来识别和定量痕量有机物种。这些物种将通过超临界流体萃取从最初发现它们的介质中分离出来。这项工作将主要由本科生完成。通过改变用于萃取的超临界流体的性质和改变离子迁移率光谱仪的参数，将实现对有机物种的选择性。与单独使用这两种方法相比，这种二维方法将提供更高的选择性。超临界流体萃取和离子迁移率光谱都是相对较新的技术。因此，它们的结合将提供各种类型的分离和迄今尚未探索的具体分析方法。

Charged species moving in viscous media move at varying rates under the influence of electric fields, dependent on the acceleration due to the field competing with the drag of the medium. A device which measures the relative speed of motion of different ions is an ion mobility spectrometer. In this research, supported by the Analytical and Surface Chemistry Program of the Chemistry Division, Prof. McMinn will use an ion mobility spectrometer to identify and quantify trace organic species. The species will be separated from the medium in which they are initially found by supercritical fluid extraction. The work will be performed largely by undergraduates. Selectivity for organic species will be achieved both by varying the properties of the supercritical fluid used for extraction and by varying the parameters of the ion mobility spectrometer. This two-dimensional approach will give enhanced selectivity compared to either method alone. Both supercritical fluid extraction and ion mobility spectrometry are relatively new techniques. Thus, their combination will afford types of separations and specific analytical methods heretofore unexplored.