Abstract
Lubricating oils, particularly those blended from hydrocarbon feedstocks for use as automobile lubricants, are economically important petroleum products. The hydrocarbons of waste lubricating oils are also quantitatively important sources of environmental pollution. However, both the feedstocks and the hydrocarbons found in sediments polluted with waste lube oils are very difficult to characterize by existing analytical methods and little is known, in detail, of their chemical composition. For example, the hydrocarbons often appear as unresolved complex mixtures (UCMs) when examined by techniques which are routinely successfully used to characterize other hydrocarbon mixtures such as crude oils (e.g., gas chromatography (GC) or GC-mass spectroscopy (GC-MS))
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