API PUBL 4592-1994

$25.35

Odor Thresholds Studies Performed with Gasoline and Gasoline Combined with MTBE, ETBE and TAME

Published By	Publication Date	Number of Pages
API	1994	76

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Description

The Clean Air Act Amendments of 1990 require that gasoline sold in areas of no attainment for carbon monoxide or ozone contain specified amounts of fuel oxygenates. Fuel oxygenates include, methyl-tertiary-butyl ether (MTBE), ethyl tertiary-butyl ether (ETBE), and tertiary-amyl-methyl ether (TAME). These oxygenated compounds increase the oxygen content of fuels, producing a more complete combustion, resulting in a reduction in carbon monoxide emissions. Oxygenated compounds such as MTBE have been previously added to gasoline to enhance octane ratings. More recently, larger amounts of oxygenates, MTBE, in particular, have been added to fuels to meet Clean Air Act Amendment requirements. This study examines the effect of oxygenate addition on the odor of gasoline blends. A commercial blend of MTBE (97Y0 purity, obtained from ARCO Chemical Co.) was also evaluated for its odor detection and recognition thresholds in air and water as well as its taste threshold in water. MTBE (99Y0 purity) and ETBE (99% purity) were also supplied by ARCO Chemical Company. TAME (94% purity) was obtained by API from Aldrich Chemical Company and supplied to TRC through API's chemical repository, Experimental Pathology Laboratories, Inc. (Herndon, VA). The gasoline blends were furnished through Experimental Pathology Laboratories, Inc., Herndon, VA (summer blend – API Reference Fuel 91-01), and Sun Co., Inc., Marcus Hook, PA (winter blend and "composite" sample). The Reid Vapor Pressure (RVP) for the gasoline blends (in psi) are 8.5, for the summer blend; 12.3 for the winter blend; and 7.9 for the "composite sample".

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