Separation of nonvolatile components of fossil fuels at very high resolution and their structural characterization. Progress report, May 1, 1985-January 31, 1986
The recently developed miniature photodiode array fluorescence detector has now been applied in conjunction with microcolumn liquid chromatography to several classes of compounds. While our typical micro-LC separations (efficiencies in the excess of 250,000 theoretical plates) yield between 50 and 100 resolved peaks, numerous spectra are taken on-line during these chromatograms. A very efficient data acquisition and processing system was developed whereby approximately, 375 spectra can be recorded on a single floppy disk. Numerous fossil fuel and related samples have now been processed through this combination: neutral polyaromatics from carbon black; nitrogen polycyclics; sulfur-containing polycyclics; and phenolic. The greatest problem is presently the limited availability of reference compounds for the polycyclics with a large number of rings. Thus, the fluorescence data obtained with the described system are limited of utility alone, however, in conjunction with mass spectral information, they can yield important information. Some examples provided in connection with the analyses of different polycyclic classes. There are two additional advantages and potential applications of the described photodiode array system. First, homogeneity of the individual chromatographic peaks can be checked by acquiring spectra in different parts of the peak elution profiles. Spectral subtraction and peak deconvolution computational techniques can be applied. Secondly, ''fingerprinting'' different types of fluorescing materials could be enhanced over that of based on just chromatography if three-dimensional plots are developed (intensity - wavelength - retention time). 9 figs., 4 tabs.
- Research Organization:
- Indiana Univ., Bloomington (USA). Dept. of Chemistry
- DOE Contract Number:
- FG02-84ER60215
- OSTI ID:
- 6215364
- Report Number(s):
- DOE/ER/60215-T1; ON: DE86007546
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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