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Subsurface detection of fossil fuel pollutants by photoionization and gas chromatography/mass spectrometry

Authors
Journal
Chemosphere
0045-6535
Publisher
Elsevier
Publication Date
Volume
80
Issue
11
Identifiers
DOI: 10.1016/j.chemosphere.2010.06.005
Keywords
  • In Situsampling Probe
  • Subsurface
  • Dense Non Aqueous Phase Liquids
  • Hazardous Waste Site Characterization
  • Photoionization Detector
  • Gc/Ms
Disciplines
  • Ecology
  • Geography

Abstract

Abstract This paper describes analysis of environmental pollutants at depth without bringing sample to the surface. It is based on an improved 3-stage Peltier freeze trap, which efficiently pre-concentrates volatile coal tar and petroleum hydrocarbons, and an integrated system for detecting pollutants on-line, in real-time by photoionization detection and quantitation by gas chromatography/mass spectrometry (GC/MS) as the probe is advanced into the subsurface. Findings indicate measurement precision and accuracy for volatiles meet EPA criteria for hazardous waste site investigations. When a Teflon membrane inlet is used to detect contaminants in groundwater, its 140 °C temperature limit restricts analyte collection in soil to C 2-phenanthrenes. Two case studies demonstrate the probe is well-suited to tracking petroleum and coal tar plumes from source to groundwater.

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