Particulate Lead Compounds in Automobile Exhaust GasWhy do urban atmospheres retain so little lead from the vast quantities of leaded gasoline burned daily? A detailed answer is given here Current interest in automobile exhaust gas as an atmospheric pollutant has led to many studies of its minor constituents such as incompletely burned hydrocarbons, carbon monoxide, and

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The spectrophotometric results show beyond question that the PbNOg+ ion is actually present in these solutions. The formation constant so obtained, although differing by a factor of two from the results of the electrical methods is actually not in bad agreement when it is considered that the lead-to-nitrate ratio differs by a factor of 20,000. Furthermore, it would be surprising indeed if the specific effects on individual activity coefficients of lead, nitrate and lead mononitrate ions were the same in 2.0 M sodium perchlorate as in 0.67 M lead perchlorate, even though the ionic strengths of the two are the same.