Kevin A. Krock, C. Wilkins
Mar 1, 1996
Citations
0
Influential Citations
18
Citations
Journal
Journal of Chromatography A
Abstract
Abstract The use of capillary gas chromatography in conjunction with spectral detection has been utilized for several years for both quantitative and qualitative analyses of environmental extracts. Unfortunately, in some extreme cases, Chromatographic peak overlap precludes the accurate identification of many of the components, and alternative separation strategies employing multidimensional techniques must be utilized to improve the qualitative information. This study presents the application of a valvebased, multiple parallel trap, multi-stage multidimensional gas chromatography-infrared spectroscopy-mass spectrometry system to qualitative analysis of extracts from water, clay and soil samples contaminated by decades of old agricultural product dumping. The water and clay extracts were found to be fairly simple and required only a single Chromatographic stage for analysis. Water and clay contaminants identified by both infrared (IR) and mass spectra included 1-chloro-4-methylsulfonyl-benzene, disulfoton, dieldrin, and several organophosphorus pesticides. In contrast, the soil extract required 25 heartcuts and second-stage separations to obtain higher accuracy qualitative identifications or classifications. Components identified by IR and mass spectra included 1-chlorooctane, dimethyl phthalate, phorate, 4,4′-dichlorobenzophenone, 3,4′-DDD, chlorobenzilate, 4,4′-DDD, and bis(2-ethylhexyl)phthalate. This study demonstrates the system's ability to perform equally well in both 1-D and 2-D configurations with these types of samples, and it also illustrates some of the temperature-dependent limitations of the system.