The extracts were cleaned by passing the extracts through silicagel columns,and the PAHs analysis was completed on the cleaned extracts with GC–MS (Thermo TSQ Quanum GC,USA).
The extracts were cleaned by passing the extracts through silicagel columns,and the PAHs analysis was completed on the cleanedextracts with GC–MS (Thermo TSQ Quanum GC,USA).