Quantitative Determination of Hydrocarbon Group-Types via High Performance Liquid Chromatography with Dielectric Constant Detection.
Final rept. Mar 84-Mar 85,
AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH
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A dielectric constant DC detector for high performance liquid chromatography HPLC is the basis of an accurate and versatile hydrocarbon group-type analysis of petroleum-and shale-derived distillate fuels. The method can saturates olefins, alkyl benzenes, and polycyclic aromatics in hydrocarbon liquids below 600 C. The HPLC separation is achieved with three columns in series, i.e., two 2 five micrometer Partisil PAC columns preceding a ten micrometer TENF column, and using n-butyl chloride as the mobile phase. A simple three-component standard mixture is all that is required to calibrate the method. The DC detector ensures a genuine uniformity of response less than 2.5 RSD for each hydrocarbon group-type independent of the carbon-number distribution of the sample. Based on simple and complex hydrocarbon standard solutions, the accuracy for each structural group-type is within 2 absolute with a chromatographic limit of detection of approximately 150 ng for a late eluting solute biphenyl.
- Physical Chemistry