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Progress in Chemistry 2002, Vol. 14 Issue (01): 32- Previous Articles   Next Articles

• Review •

Application of Subcritical Water Extraction in Analytical Chemistry

Wu Renming   

  1. Shanghai Environment Monitoring Centre, Shanghai 200230, China
  • Received: Revised: Online: Published:
  • Contact: Wu Renming
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At ambient temperature and pressure water has a dielectric constantε = 80. However, I he dielectric constant of subcritical water can be lowerd by raising the temperature of the water under moderate pressure. Subcritical water at 250 ℃ and 5 MPa hasε = 27,which is similar to those of ethanol (ε = 24) and methanol (ε = 33). Thus,the solubilities of low polarity organics such as PAHs and PCBs can be increased by heating the water under moderate pressure. Furthermore,subcritical water has been shown to be a feasible medium polarity replacement for methanol-water or acetonitrile-water mixture as an eluent for reversed-phase HPLC.
Key words: subcritical water, extraction, eluents

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