Effects of ethanol as an additive on odor detection thresholds of Alaskan gasolines at sub-arctic temperatures |
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Authors: | Xiaohong Zhao Sherri L Smith Lawrence K Duffy |
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Institution: | Xiaohong Zhao, Sherri L. Smith,Lawrence K. Duffy* |
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Abstract: | This study evaluated the odor thresholds of two Alaskan unleaded gasolines, Tesoro and Mapco, and their ethanol oxyfuel blends at typical winter temperatures of −25°F, O°F, and +25°F. We found that temperature had a slight but variable effect on both odor thresholds and headspace composition. When 10% ethanol was added to Tesoro, a refined gasoline, there was a significant lowering (83%) of the odor detection threshold, i.e., an increase in human sensitivity to the odor. Vapors formulated from 10% ethanol-Mapco gasoline mixtures did not change the odor detection threshold. This study supports the hypothesis that the base gasolines interact variably with oxygenate additives. Ethanol appears to behave in a dissimilar manner when added to gasolines with different aromatic content. |
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