tetraethyl lead


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tetraethyl lead

(tĕt'rəĕth`əl), (C2H5)4Pb, viscous, colorless, poisonous liquid. It is an organometallic compound prepared by reacting ethyl chloride with a sodium-lead alloy. When added to gasoline, it improves the combustion characteristics (see octane numberoctane number,
figure of merit representing the resistance of gasoline to premature detonation when exposed to heat and pressure in the combustion chamber of an internal-combustion engine.
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). When tetraethyl lead burns in an engine, lead oxide is formed. Ethylene dibromide is usually also added to the gasoline; on burning, the resulting mixture forms products that react with the lead oxide to form lead bromide, a volatile compound that escapes from the engine with other exhausted products. Because the lead bromide is poisonous, lead-free gasolines are required in the United States. An additional reason for lead-free gas is that the lead in the exhaust pipe would poison the catalytic converter that is standard equipment for U.S. cars. Catalytic converters which serve to oxidize unburned hydrocarbons, carbon monoxide, and nitrogen oxides contain platinum group metals that are inactivated by lead.

tetraethyl lead

a colourless oily insoluble liquid used in petrol to prevent knocking. Formula: Pb(C2H5)4
References in periodicals archive ?
[30.] Milmo, C., "Made in Britain: The Toxic Tetraethyl Lead Used in Fuel Sold to World's Poorest," The Independent, 2016, http://www.independent.co.uk/news/uk/home-news/made-in-britain-the-toxic-tetraethyl-lead-used-in-fuel-sold-to-worlds-poorest-8449967.html, accessed Oct.
Adding tetraethyl lead to gasoline resulted in large emissions into the
In a statement, the SFO said Mr Jennings "is accused of two allegations of conspiracy to corrupt, in that he gave or agreed to give corrupt payments to public officials and other agents of the Gover nments of Indonesia and Iraq as inducements to secure, or as rewards for having secured, contracts from those gover nments for the supply of its products including Tetraethyl Lead by Innospec.
The average BLL in children from deprived urban areas has probably begun to rise as early as the 1940s, due to the addition of tetraethyl lead to gasoline combined with use of lead-based pigments in house paints.
How industry could determine the outcome of a controversy by controlling the terms of debate was strikingly and tragically illustrated by the case of a close relation to white lead: the gasoline additive tetraethyl lead (TEL).
Her recent text, also entitled, When Smoke Ran Like Water, is an interesting read on exposure and corporate malfeasance, such as adding tetraethyl lead to the gasoline in this country, and then admittedly using a female spokesperson named Ethyl to quell any concerns of personal harm to the populace.
The European Commission has decided to allow two products used for industrial purposes, tetraethyl lead and tetramethyl lead, to be imported into the EU under certain conditions, but decided to ban the importing of parathion, a toxic substance used in pesticides.
Lead was introduced into gasoline in the 1920s in the form of tetraethyl lead (TEL), a compound of lead and four organic molecules.
In some cases, plaintiffs have added entities totally unrelated to the manufacture of lead pigment and lead paint, including lead mining companies, lead smelters, and manufacturers of tetraethyl lead, a former gasoline additive.