Table III lists elemental analysis data for some fractions isolated from two CO-Steam products. The toluene eluate is essentially free of nitrogen compounds, while the second chloroform fraction includes about 70% of the nitrogen compounds in the original oil. This separation of nitrogen compounds from ethers and hydroxyl compounds allows accurate compound assignments by mass spectrometry of major hydrocarbon and heteroatom compounds.Elution data for pure compounds spiked into an SRC sample are shown in Table IV. The fraction where a given compound appeared was consistent with the HRMS data (Table II) and with the solvent polarity and adsorbent activity for the system used. The order of elution was the same as that shown in Table I. Some polymeric material of varying polarity may be eluted in these fractions along with the compound classes indicated. Because of their high molecular weight, these polymeric materials do not volatilize into the MS or GC-MS and, therefore, they do not interfere with characterization of the lower molecular weight material by these methods.

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