Study on Extraction Techniques of Polynuclear Aromatic Hydrocarbons in Spiked Solid Samples

A few recent developed techniques for environmental sample preparation and pretreatment, such as supercritical fluid extraction, microwave assisted extraction and ultrasonic extraction have been compared with traditional Soxhlet extraction.The influences of temperature, modifier and other parameters on the efficiency of supercritical fluid extraction were tested. The applications of these 4 techniques to the extraction of 16 kinds of polynuclear aromatic hydrocarbons in synthetic environmental samples have been presented.The results from GC/MS analysis show that the supercritical fluid extraction with pure CO 2 and without any modifier is preferable to the extraction of polynuclear aromatic hydrocarbons with lower boiling point (with recovery of 80%) and microwave assisted extraction is preferable to the extraction of polynuclear aromatic hydrocarbons with higher boiling point.