Abstract: A two-dimensional GC method for the analysis of oxygenated additives in gasline is described .This method employ an Agilent 7890N GC system equipped with a Deans swith device to dynamically heart-cut the analytes from the gasline matrix to a second GC column . The unique design of the heat-cut device allows fast easy method setup when determining cut times .The Agilent 7890N GC electronic pneumatices control (EPC) used for this system provides better retention time precision that allows narrower cut times for better resolution an quantitative precision . Excellent calibration an quantitative performance of this system is demonstrated for several commonly used oxygenated additives .The linearity test showed that the correlation coefficient r2 values for oxygenated additives were all higher than 0.999.The results showed that the relative standard (RSDs) of standard samples in five continued were within 1.29%and the recoveries of added standards tests were from 90%～110%.The EPC of the Agilent 7890N GC is shown to enable greater productivity by decreasing analysis times with a backflushing technique .The method is quick ,sinple an useful for the determination of oxygenated in gasline .
Keywords：two-dimensional gas chromatography ;capillary flow technique (Deans Switch );oxygenated ;gasline
