[[alternative]]Application of Ase and Isotope Dilution GC-MS for the Determination of 35 PAHs in Soil Samples

[[abstract]]A new technique for sample preparation, accelerated solvent extraction (ASE), that combines elevated temperature and pressure with liquid solvent is utilized in this study to pretreat soil samples for PAH analysis, The effects of various operational parameters (i.e. temperature, pressure, solvent type, extraction time) on the performance of ASE were investigated.The research aims at the development of a new sample pretreatment .technique for 35 polynuclear aromatic hydrocarbons (PAHs) in soil samples with GC-FID and isotope dilution GC-MS. The analytes are extracted by acetonitrile at 130℃ and 1500 psi within 5 minutes of static extraction.The time for the entire extraction process is 20 minutes.Results demonstrated that the ASE extraction is selective for PAHs.Thus, a further clean-up procedure after ASE is not necessary.The procedure of the extraction is simple and fast.ASE in recovery compared with Soxhlet extraction is higher.The results from CRM 103-100 and QCS345 analyses further vrified the high precision and accuracy of the developed analytical scheme.The result from real samples demonstrated that the concentration of PAHs in soil is low.