Static headspace analysis of volatile organic compounds in soil and vegetation samples for site characterization |
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Authors: | Alvarado Jorge S Rose Candace |
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Institution: | Environmental Research Division, Argonne National Laboratory, Argonne, IL 60439, USA |
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Abstract: | Traditional methodologies for the characterization of volatile organic compounds (VOCs) in subsurface soil are expensive, time-consuming processes that are often conducted on samples collected at random. The determination of VOCs in near-surface soils and vegetation is the foundation for a more efficient sampling strategy to characterize subsurface soil and improve understanding of environmental problems.In the absence of a standard methodology for the determination of VOCs in vegetation and in view of the high detection limits of the method for soils, we developed a methodology using headspace gas chromatography with an electron capture detector for the determination of low levels (parts-per-billion to parts-per-trillion) of VOCs in soils and vegetation. The technique demonstrates good sensitivity, good recoveries of internal standards and surrogate compounds, good performance, and minimal waste. A case study involving application of this technique as a first-step vadose-zone characterization methodology is presented. |
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Keywords: | Volatile organic compounds Vegetation Soils Static headspace Site characterization |
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