Modulator Design for Comprehensive Two-Dimensional Gas Chromatography: Quantitative Analysis of Polyaromatic Hydrocarbons and Polychlorinated Biphenyls

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• 作者：Tuulia Hy&ouml ; tylä ; inen ; Minna Kallio ; Kari Hartonen ; Matti Jussila ; Sami Palonen ; and Marja-Liisa Riekkola
• 刊名：Analytical Chemistry
• 出版年：2002
• 出版时间：September 1, 2002
• 年：2002
• 卷：74
• 期：17
• 页码：4441 - 4446
• 全文大小：167K
• 年卷期：v.74,no.17(September 1, 2002)
• ISSN：1520-6882

文摘

A novel cryogenic modulator was constructed for comprehensive two-dimensional gas chromatography (GC×GC).The modulator is based on two-step cryogenic trappingwith CO₂ and thermal desorption with electric heating.The GC×GC system included a nonpolar first-dimensioncolumn and two semipolar second-dimension columns,one connected to a flame ionization detector and the otherone to a electron capture detector. A Matlab-based program, which allowed determination of peak heights andvolumes, was written for the data analysis. The GC×GCsystem was applied for the analysis of polyaromatichydrocarbons and polychlorinated biphenyls. The functioning of the modulator and the quantitativity of themethod were studied with both peak volumes and peakheights from a three-dimensional plot. The separate peakareas from the modulated chromatogram were calculatedas a comparison. The quantitative results were comparedwith those obtained with the same system but without thethermal modulation. The method was found to be repeatable and linear with use of peak volumes as well as peakheights. There was also good agreement with the resultsobtained by integration of separate peak areas. Thedeveloped GC×GC method was applied to the analysis ofa Soxhlet extract of a certified sediment sample. Theresults were compared with the certified values.