Abstract
The subject of vehicle emissions has received much attention during the past several years. The particle size as well as the chemistry of the exhaust particles, particularly the ones containing lead, has been a controversial subject because of environmental implications and the effects of lead compounds on the effectiveness of catalytic converters. Although it has been fairly well established by X-ray diffraction studies that the solids consist of a complex mixture of carbonaceous matter and inorganic salts, there has been disagreement as to the particle sizes and ultimate chemistry of the lead compounds in the exhaust which result from the addition of tetraethyllead (TEL). In general, the TEL is volatilized in the combustion chamber and is “scavenged” by halides, typically Br and Cl which are added as ethyl dibromide and chloride.
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