Aromatic from South Louisiana crude

Figure 4a shows the 13C spectra of the total aromatics and di- + triaromatics subfractions of Kuwait crude oils. Figure 4b shows the 13C spectra of the monoaromatics and di- + triaromatics from South Louisiana crude. These have been recorded with a commercially available CFT-20 Varian Associates 13C NMR spectrometer. CDC13 solutions of each fraction have been utilized along with tetramethylsilane (TMS) for calibration purposes. The numbers under the individual peaks indicate the chemical shifts of nonaromatic carbons in the range of 14.11 ppm to about 37.16 ppm. 

Figure 4b. 13C NMR of aromatic fractions from South Louisiana crude...

Table IV. Summary of Selected Aromatic Hydrocarbon Data from BLM Intercalibration Program with Santa Barbara Sediment Spiked with South Louisiana Crude Oil (pg/g dry weight)...

Table IV gives some of the parameters that have been derived from the manipulation of the integrated intensities of the various chemically shifted signals of the aromatic fractions and subfractions of Kuwait and South Louisiana crudes. Profiles that emerge from these baseline studies are the following ...

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