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Pulsed Splitless and Large-Volume Injection in Capillary Gas Chromatography Mass Spectrometry for the Determination of Ultra-Trace Level Pesticide Residues

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Abstract:The possible presence of ultra-trace levels (sub- parts per trillion) of pesticides in pristine aquatic environments (e.g., alpine lakes) would raise questions regarding potential effects on biota. One hypothesis is that agricultural pesticides that are heavily applied in the San Joaquin Valley , California have drifted to the east of the valley, have been deposited along wind paths, and have reached high-elevation lakes of the Sierra Nevada. If so, these pesticides could be responsible for the disappearance of the mountain yellow-legged frogs. Conventional analytical techniques using gas chromatography/mass spectrometry (GC/MS) for the determination of these pollutants cannot detect sub-parts per trillion levels. In order to quantify ultra-trace levels of pesticides, it is necessary to develop an analytical method for accurate and reliable determination of these pollutants. Toward this end, this poster presents experimental results for two sample introduction techniques, pulsed splitless injection (PSI) and large-volume injection (L VI), into a capillary column GC/MS. PSI introduces 1 uL of sample into the inlet liner at a pulsed high pressure, while L VI slowly injects at least 20 uL of sample into the GC inlet liner at a temperature below the solvent's boiling point. Optimization of parameters and analytical figures of merit for the two techniques will be presented.
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Citation:Rosal, C. G., L. A. Riddick, G. M. Momplaisir, E. M. Heithmar, and K. E. Varner. Pulsed Splitless and Large-Volume Injection in Capillary Gas Chromatography Mass Spectrometry for the Determination of Ultra-Trace Level Pesticide Residues. Presented at National Environmental Monitoring Conference 2003, Arlington, VA, July 21-24, 2003.
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Contact: Chris Siebert - (702) 798-2234 or siebert.christopher@epa.gov
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Division: Environmental Sciences Division
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Branch: Environmental Chemistry Branch
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Product Type: Abstrct/Oral
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Presented: 07/21/2003
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Related Entries:
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Bullet Item Environmental Chemistry
spacer Relationship Reason:   A Project of the Product
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Last Updated on Monday, October 22, 2007
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