Identification of Inflammable Liquids (Ethanol,Ether and Acetone) in Debris of Fire Scene by Hyphenated GC-MS with SPME

Sample of debris collected from fire scene was sealed in a metal vessel or plastic bag,and heated at 80 ℃ for 20-30 min.Inflammable liquid (in vapor state) in the vessel or bag was adsorbed on the PA (ester of polypropenoic acid) fibre through syringe needle of the SPME installation for 5-10 min.Inflammable liquid was desorbed and introduced into the GC instrument and determined under the prescribed conditions of GC-MS analysis.By analyzing the principal peak observed in the chromatograph,abstracting the mass spectrum of this pure compound as well as its related information,and finally retrieving and comparing with the standard reference spectra in the database,the respective inflammable liquid was identrified.