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Tetraethyl lead: An anti-knock compound added to motor fuel. Also known as tetraethylplumbane, tetraethyl lead has highly adverse effects on human health.It causes lead poisoning.n 1927 the Surgeon General set a voluntary standard for the oil industry to follow in mixing tetraethyl lead with gasoline. This standard -- 3 cubic centimeters per gallon (cc/g) -- corresponded to the maximum then in use among refiners, and thus imposed no real restraint.
Either hexavalent chromium or trivalent chromium may be used to produce chrome. The electroplating chemicals for both processes are toxic and regulated in many countries. Hexavalent chromium is extremely toxic, so trivalent chrome or tri-chrome tends to be more popular for modern applications.In 2007 hexa-chrome was banned for use on automobiles in Europe.ither hexavalent chromium or trivalent chromium may be used to produce chrome. The electroplating chemicals for both processes are toxic and regulated in many countries. Hexavalent chromium is extremely toxic, so trivalent chrome or tri-chrome tends to be more popular for modern applications.