22 Aug 2017

Gasoline components

An Example Where the Interpretation is Critical: the Case of MTBE

When added to gasoline, MTBE (methyl tertiary butyl ether) can:
• reduce ozone emissions by 15%
• reduce benzene emissions by 50%
• reduce carbon monoxide emissions by 11%
• but, MTBE is toxic to humans
Should we use MTBE?

Despite its potential benefits on air quality when added to gasoline, MTBE has some properties that can cause health problems. MTBE is much more soluble in water than most other components of gasoline. If it gets in the ground, it can travel faster and farther through groundwater. This makes it more likely to contaminate public water systems and private drinking water wells if gasoline is spilled on the ground or leaks out of underground storage tanks. Even fairly small amounts of MTBE in water can give it an unpleasant taste and odor, making the water undrinkable. MTBE also does not break down (biodegrade) easily. As a result, it is harder to clean up once contamination occurs.

Its use has declined in the United States in response to environmental and health concerns. In Europe and Asia is still being used.

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