Novel Analytical Techniques Based on a Enhanced Electron Attachment Process - Final Report - 09/15/1996 - 06/15/2001

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Present analytical methodologies for the detection of chlorinated compounds important to DOE's environmental restoration program, such as DNAPLs [dense non-aqueous phase liquids - such as carbon tetrachloride, trichloroethylene (TCE), perchloroethylene (PCE)], polychlorinated biphenyls (PCB), and others, involve detection by negative-ion-based analytical techniques. These techniques exploit electron attachment to analyte molecules in their ground electronic states, and are limited to particular compounds with appropriate electron capture cross sections. For example, PCB contamination is detected by analysis of mixtures of chlorinated homologues of these biphenyls. Homologues with lower numbers of chlorines do not efficiently attach thermal electrons and thus are not detected ... continued below

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Pinnaduwage, Lal A. & Buchanan, Michelle V. June 15, 2001.

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Present analytical methodologies for the detection of chlorinated compounds important to DOE's environmental restoration program, such as DNAPLs [dense non-aqueous phase liquids - such as carbon tetrachloride, trichloroethylene (TCE), perchloroethylene (PCE)], polychlorinated biphenyls (PCB), and others, involve detection by negative-ion-based analytical techniques. These techniques exploit electron attachment to analyte molecules in their ground electronic states, and are limited to particular compounds with appropriate electron capture cross sections. For example, PCB contamination is detected by analysis of mixtures of chlorinated homologues of these biphenyls. Homologues with lower numbers of chlorines do not efficiently attach thermal electrons and thus are not detected by either electron capture chromatographic detectors or by negative ion chemical ionization mass spectrometry. We proposed three novel analytical techniques based on enhanced negative-ion formation via electron attachment to highly-excited electronic states of molecules. In one of the proposed techniques, the excited states of the (analyte) molecules are populated via laser excitation; the resulting negative ions are mass analyzed for identification. The other two proposed techniques utilize a specialized gas discharge for the formation of excited species (and low-energy electrons for attachment), and thus will provide a cost-effective method if successful. In one version, the negative ions will be mass analyzed -as in the laser-based technique- and in the other, the decrease in electron density due to excited state attachment will be monitored (electron capture detector mode). A plasma mixing scheme will be employed to excite the analyte molecules so that the excited states of the analyte molecules will not be destroyed by the discharge.

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INIS; OSTI as DE00790365

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  • Other Information: PBD: 15 Jun 2001

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  • Report No.: DOE/ER/62304
  • Report No.: Project Number 55328
  • Grant Number: FG07-96ER62304
  • DOI: 10.2172/790365 | External Link
  • Office of Scientific & Technical Information Report Number: 790365
  • Archival Resource Key: ark:/67531/metadc720970

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  • June 15, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 21, 2016, 6:44 p.m.

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Pinnaduwage, Lal A. & Buchanan, Michelle V. Novel Analytical Techniques Based on a Enhanced Electron Attachment Process - Final Report - 09/15/1996 - 06/15/2001, report, June 15, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc720970/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.