Overview
This study examined how platinum and palladium are distributed between dissolved, nanoparticulate, and microparticulate fractions in Moscow road dust. The work provides particle-size-resolved Pd concentrations and estimates the fraction available for dissolution and nanoparticle transport, which is relevant to understanding human inhalation and dermal exposure from traffic-related Pd.
Key numbers
- Moscow road dust Pd mean: 50 ng/g, range 35-235 ng/g (dry weight)
- Nanoparticulate fraction of Pd and Pt in road dust: approximately 1.6-1.8%
- Dissolved fraction of Pd in road dust leachate: 4-10%
- Pd concentrations higher than Pt in Moscow road dust
- Pd > Pt pattern consistent with other cities (Rome, Hong Kong, Beijing, Toronto)
- Analytical method: ICP-MS after size fractionation
Methods (brief)
Road dust collected from Moscow streets. Sequential size fractionation into dissolved (<0.45 um), nanoparticulate (0.45 um - 1 um), and microparticulate (>1 um) fractions. Each fraction analyzed by ICP-MS. Leachate experiments to quantify mobile dissolved fractions.
Implications
This page makes the source discoverable for palladium evidence routing. Provides Moscow road dust Pd concentrations and fractionation data, showing that the majority of Pd in road dust is in the microparticulate fraction rather than dissolved or nanoparticulate forms, which informs inhalation and dermal bioavailability assessments.
Related evidence
Update history
No substantive edit history is available in this build. The full commit record is available in git.