Subcritical water has been successfully used as an environment-friendly extraction fluid for many classes of organic compounds. While only solvent trapping was used in previous subcritical water extractions, sorbent trapping has been tested for subcritical water extraction in this study. After subcritical water extraction, the sorbent trap (silica-bonded C18 column) was coupled to a HPLC system for analysis. The coupling technique of subcritical water extraction with HPLC eliminates the liquid−liquid extraction used in subcritical water extractions with solvent trapping and provides better sensitivity. Alkylbenzenes and polycyclic aromatic hydrocarbons were extracted from sand and contaminated soils and then analyzed using this new coupling technique. The effects of volume, temperature, and pressure of water on organic recoveries are also discussed in this paper.
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Yang et al. (1999) studied this question.
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