WASTE LUBRICATING OIL RESEARCH:PART 4 A Summary of Composition Variations Among 30 Used Lubricating Oils Selected for Seasonal and Geographical Significance

摘要

Geographical and seasonal variations in the composition of used automobile lubricating oil were evaluated. The investigation was based upon 30 samples of waste oil collected from 20 states within the Continental United States. The oils were analyzed by standard physical and chemical tests to measure contaminant levels, and highly sensitive chromatographic and mass spectral techniques were used to estimate the quantity of probable compound types and the distribution of major structural groups in these samples. Statistical methods were used to evaluate the differences noted among the 30 oils and to estimate the concentration range of specific compound types that could be anticipated from any waste automotive lubricating oil from within the United States, collected and composited similarly, to the samples of this study. In addition, five pairs of waste crankcase draining were obtained from identical collection tanks at five different locations at differing times of the year to evaluate compositional variations that were considered seasonal fluctuations. The results showed no systematic variations in either contaminants or basestock composition attributable to either geographical or seasonal considerations.