Abstract
The stable lead isotope abundances of environmental samples collected from Helsinki area were determined. The separation of lead from samples were carried out using wet ashing and anion exchange. For the determination of the lead isotope ratios a thermal ionization mass spectrometer type MI-1309 was used. The average ratio of Pb-206/Pb-204 in air filter, lichen and incinerator ash samples were 17.5+−0,3, 17.7+−0.3 and 18.4+−0.4, respectively. The mean value of the ratio Pb-206/Pb-204 in gasoline was 16.42+−0.24. This value being significantly lower than in other samples analyzed gives an opportunity to evaluate the contribution of motor traffic to lead content of environmental samples.
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