Fast Qualitative Analysis of Dioxins in Fly Ash by Comprehensive Two Dimensional Gas Chromatography Coupled Time of Fight Mass Spectrometry
Comprehensive two dimensional gas chromatography (GC×GC-TOFMS) has been applied to fast qualitative analysis of 17 polychlorinated dibenzo-p-dioxins and dibenofurans (PCDD/Fs).GC×GC-TOFMS parameters were evaluated and optimized to yield complete separation for 17 PCDD/Fs from interference,and to attain the high sensitivity.After optimization,all 17 PCDD/Fs were separated in 42.5 min.The critical and most toxic tetrachloro-dibenzo-p-dioxin (TCDD) detection was up to 0.5 pg/μL.The method was used to analyze a real fly ash sample.Accurate identification and determination of all analytes were by GC×GC,mass spectrum library and ion ratio.The technique could be a substitute and supplement for high resolution gas chromatography/high resolution mass spectrometry in the field of dioxin analysis.