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Determination of total petroleum hydrocarbons in soil by on-line supercritical fluid extraction-infrared spectroscopy using a fiberoptic transmission cell and a simple filter spectrometer


Determination of total petroleum hydrocarbons in soil by on-line supercritical fluid extraction-infrared spectroscopy using a fiberoptic transmission cell and a simple filter spectrometer



Journal of Chromatography A 785(1-2): 269-277



ISSN/ISBN: 0021-9673

DOI: 10.1016/s0021-9673(97)00466-4

An on-line supercritical fluid extraction-infrared (SFE-IR) instrument is described for determining total petroleum hydrocarbons (TPHs) in soil samples. This instrument is constructed from a commercially-available SFE system and filter IR spectrometer, and an easily-constructed fiber optic IR cell. All SFEs are performed statically (i.e., no fluid flow once the SFE vessel is filled) for 30 min at 80degreeC and 340 atm. Detection limits for TPH were determined to be ca. 8 ppm for an IR cell with a 1-mm optical path, and are shown to degrade with increasing pathlength. The results from the application of this on-line SFE-IR instrument to the determination of TPHs in real-world samples show good agreement with those obtained from a standard Soxhlet extraction-IR method. Relative standard deviations of the on-line determinations are in the range of 7-10%.

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Accession: 008449179

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