Kovats Indices as a Tool in Characterizing Hydrocarbon Fuels in Temperature Programmed Glass Capillary Gas Chromatography. Part 1. Qualitative Identification

摘要

Kovats Indices are used as a tool to identify the major components of several aircraft jet fuels of the JP-4 type. Glass capillary gas chromatography in the temperature programmed mode was the technique of choice. The first phase of the effort involved optimization of the capillary system for the maximum resolution between a selected pair of normal hydrocarbons in an acceptable analysis time. Peak resolution was investigated as a function of carrier capillary pressure, temperature programming rate, and initial column temperature. Eleven qualitatively known and quantitatively accurate calibration solutions were prepared to include over 200 different hydrocarbons. Kovats Indices were generated for these solutions in a statistically reliable fashion on two capillary columns of different polarities. Thus, each hydrocarbon standard had its own unique set of two Kovats Indices. Several petroleum, as well as shale derived, JP-4 samples were subsequently chromatographed on the same two capillary columns. Peaks were given tentative identification by matching of Kovats Indices. (Author)