gas chromatography method for detecting a marker compound in an petroleum hydrocarbon or a liquid fuel

摘要

1/1 summary “Gas chromatography method for the detection of a marker compound in a petroleum hydrocarbon or a liquid wool fuel” Method for detection gas chromatography of a compound in a fuel marker by (a) introducing a fuel sample into a first capped column coated with a polydimethylsiloxane-based stationary phase and allowing the sample to flow through first column to produce a first effluent; (b) allowing the first effluent to pass through an identification detector and a retention time interval therein including a retention time of the marker compound; (c) introducing only a portion of the first effluent stream that is within the retention time interval into a second capillary column coated with either (i) an ion adsorbent or (ii) a polyethylene glycol, and allowing said portion to flow through the second capillary column to produce a second stream of effluent; and (d) allowing the second effluent to pass through a detector; wherein the marker compound has the air (r) (or) formula and is not present in the fuel at a level of 0.01 ppm to 100 ppm.