Aspects of High-Resolution Gas Chromatography as Applied to the Analysis of Hydrocarbon Fuels and Other Complex Organic Mixtures. Volume 1

Abstract

Symmetric elution zone profile 3 Partially disengaged solute zones 4 Block diagram of basic systems approach 5 Three general forms of Chromatographie zone profiles Ig 6 Different combinations of solute zone profiles. 17 7 Rapidly generated chromatogram of a jet fuel. . 8 Chromatogram of a jet fuel obtained with a Pyrex glass open tubular column 9 Gaussian and exponentially modified Gaussian elution zone profiles 10 Series of normal paraffins eluted from a contaminated column 11 Elution behavior after removing contaminated section of column 12 Open tubular column gas chromatograms that exhibit unusual baseline behavior 13 Undesirable quantitative behavior 41 14 Relationship of three-component gas Chromatographie compromises 4 3 15 Relationship of admitted solute versus solute zone variance 44 16 Graphic procedures for measuring solute zone asymmetry 4 6

Multidimensional High-Resolution Gas Chromatographic Investigations of Hydrocarbon Fuels and Various Turbine Engine Fuel Precursors.

“…A recent study of HRGC as applied to the analysis of turbine engine fuels and other complex organic mixtures [3] showed that attention must be given to every aspect of the chromatographic system to obtain high performance, well shaped elution profiles, good quantitative data, and long useful life from the chromatographic system. From a theoretical standpoint, if two different solutes have a measurable difference in their partition ratios, they can be separated with an adequately efficient column.…”

“…Also, the use of tandem dissimilar columns, "* column systems which incorporate various switching mechanisms, and the information content of this mode of gas chromatography have been investigated. Several studies [14][15][16][17][18][19] have investigated two-dimensional GC which involved dissimilar stationary phases, various forms of column switching, and backflushing to obtain *A shorter and earlier review of MDGC with respect to GC system design was presented in reference [3], pages 101 through 106.…”

“…The on-column injection of samples for chromatographic systems which use OTCs has received considerable attention and acceptance [104,1051. Although the MDGC system has been equipped with an on-column injector, most of the work performed thus far has been conducted using the split-mode of sample injection.…”

“…These initial examinations were performed using the modified HRGC instrument [3], and the output signal (chromatogram) was recorded using a Varian 4270 Recording Integrator. However, when the microbore OTC was connected into the MDGC system, considerable tailing of emerging solute zones was evident.…”

“…(3 This term will be of value later during the characterization (_f a zone's dispersion as it migrates through the thermal gradient column. However, before examining zone spreading, it should be pointed out that since…”