User:Milton Beychok/Sandbox
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Tetra-ethyl lead (TEL) is a viscous liquid with the chemical formula (CH3CH2)4Pb. Once widely used (circa 1925 to 1990) to increase the octane rating of gasoline (petrol), TEL usage in gasoline has been largely phased out by most nations[1]primarily because of the toxicity of the lead emissions from spark-ignited internal combustion engines burning gasoline containing TEL. Another reason for discontinuing TEL usage was that it degraded the efficiency of the catalytic converters installed in automotive vehicles to reduce their emissions of air pollutants.
- ↑ http://www.uneptie.org/energy/transport/documents/pdf/phasingLead.pdf Phasing Lead Out of Gasoline] A report issued by the United Nations Environmental Programme (UNEP). See page 8 of 23 pdf pages.