[Accumulation characteristics of PGEs in multimedia from road environment]

In order to study accumulation characteristics of PGEs in multimedia from road environment, samples of road dust, roadside soil and plant were collected from five roads in Shanghai, and were analysed by ICP-MS following aqua regia digestion. The results are as following: average concentrations of Rh, Pd and Pt were 24.92, 88.39, 22.28 ng/g in dust, 3.64, 17.45, 0.97 ng/g in soil and 2.66, 6.39, 0.57 ng/g in plant, respectively. The concentrations of PGEs in dust were higher than that in soil and in plant. Meanwhile, PGEs concentrations in plant were lower than that in dust, and closed to that of soil. The implementation of the automobile emission standard only in central city of Shanghai didn't cause obvious correlation between PGEs in multimedia and traffic volume. The plant adsorption capacity for PGEs of road dust showed: Pt > Pd > Rh, while its absorptive capacity for PGEs of soil was: Pd > Rh > Pt. PGEs ratios in multimedia were not completely coincident but in the range of PGEs ratios of road dust in Shanghai, which indicated a common traffic-related source of these metals.