Abstract
The gaseous lead alkyls in ambient air were collected by enrichment in an adsorption tube at liquid air temperature. The desorbed lead alkyls were analyzed by atomic adsorption spectrometry. The measured concentrations of the gaseous lead alkyls vary between 0.001 μm −3 in the environment of Frankfurt/Main and 0.2μgm −3 in a city-street with high traffic-density. Paniculate lead was simultaneously measured. The ratio of gaseous organic lead to particulate lead varies with time and space between 1 and 20%. Within a street canyon particulate lead concentrations decrease more rapidly with altitude than the gaseous lead compounds. Chromatographie separation of lead alkyl samples showed that the more volatile and chemically more stable tetra-methyl-lead (TML) represents roughly 3 4 of gaseous lead in urban atmosphere.
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