A method is described for determination of polycyclic aromatic hydrocarbons（PAHs） in soil by gas chromatography with ultrasonic extraction.The effects of different extraction methods

ultrasonic time and extraction times on the standard recovery were compared.Giving the optimized condition is as follow: 10.0 g of sample is extracted ultrasonically with 20 ml N-hexane: acetone（1+1

v/v） as extraction solvent for 15 min and 4 times.Linearity ranges of 16 PAHs are within 20.0～500 μg/L and detection limits were 0.26～0.54 μg/kg.Blank silica sand average recovery was 63.0%～117.3%

average relative standard deviation was 4.3%～12.5%

and soil samples average recovery was 76.3%～110.3%

average relative standard deviation was 5.1%～18.6%.The results showed that this method had good operability

detection limits and accuracy

is able to accurate qualitative and quantitative analysis of PAHs in soil.