Gas and Liquid Chromatographic Analyses of Methanol, Ethanol, t-Butanol, and Methyl t-Butyl Ether in Gasoline

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Abstract
Several chromatographic methods were evaluated for the analysis of low molecular weight alcohols (methanol, ethanol, and t-butanol) and methyl t-butyl ether (MTBE) in gasoline. The alcohols were determined by gas chromatography (GC) following aqueous extraction of the gasoline. MTBE was analyzed by either a GC or liquid chromatographic (LC) procedure. In the GC procedure, MTBE was isolated from gasoline by adsorption chromatography, desorbed from the adsorbent, and analyzed by GC. In the LC procedure, the MTBE-gasoline mixture was dissolved in acetonitrile and injected directly onto a reversed-phase LC column. The accuracy and precision of these methods were typically ± 3% relative or better.

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