mosphere. The boat is subsequently pushed slowly into an 800 °C inlet. The results of this latter technique on the fuel oil samples exhibited much greater precision (±2.0% relative standard deviation) and good accuracy, so that for routine analysis the latter procedure is considered the more reliable. The precision of the reductive sulfur technique for industrial petroleum samples is summarized in Table VIII.All samples with sulfur greater than 500 ppm were diluted in toluene to approximately 50 ppm for the coulometric data shown here. The number of duplicate analyses per man-day is on the order of twenty (40 determinations), exclusive of dilution time. ACKNOWLEDGMENTThe authors thank Dean Hoggan of ARCO Chemical Co., Anaheim, Calif., for permission to use the ASTM results presented and for valuable help in coordinating this study.

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