Abstract
Abstract Supercritical fluid extraction (SFE) with sorbent and solvent traps was used for extracting total petroleum hydrocarbons (TPH) from real-world soil samples contaminated with gasoline- or diesel-range hydrocarbons. Quantitative extractions using two SFE systems were performed at 80°C and 340 atm with a flow-rate of 1.5 ml/min. Both sorbent and solvent trapping could effectively (⩾90%) collect BTEX (benzene, toluene, ethylbenzene, and xylenes). Sorbent trapping yielded quantitative collections (⩾88%) of n -alkanes as volatile as n -hexane, while the solvent trapping effectively collected n -alkanes as volatile as n -heptane (pressurized trapping system) or n -octane (normal trapping system). The quantitation of BTEX, TPH, and individual species from contaminated soils obtained by the two SFE systems agreed well. Because of the greater losses of BTEX and volatile n -alkanes, Soxhlet extraction yielded significantly lower BTEX, TPH, and individual species values than SFE.
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