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本工作用超临界ＣＯ２对环境模拟样品中的正构烷烃和多环芳烃的超临界分级萃取方法及超临界ＣＯ２的压力，温度和用量对分级效率的影响进行了详细的研究。结果表明，在低压、低温下（８０ＭＰａ，５０℃）能成功地分级萃取正构烷烃和多环芳烃，其Ｃ１０～Ｃ１８的萃取率为９９．９４％～５９．２８％，而多环芳烃基本未被萃取。当压力升至２６．０ＭＰａ、温度升至８０℃时，可有效地萃取多环芳烃，实现了正构烷烃和多环芳烃的有效分离
In this work, supercritical CO2 supercritical fractional extraction of n-alkanes and polycyclic aromatic hydrocarbons (PAHs) in environmental samples and the effect of supercritical CO2 pressure, temperature and dosage on classification efficiency were studied in detail. The results showed that the extraction efficiencies of n-alkanes and polycyclic aromatic hydrocarbons were 99.94% -59.28% at low pressure and low temperature (80MPa, 50 ℃) Not extracted. When the pressure rose to 26.0MPa, the temperature rose to 80 ℃, the extraction of polycyclic aromatic hydrocarbons can be effectively achieved n-alkanes and polycyclic aromatic hydrocarbons effective separation