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Airborne platinum concentrations in Munich city buses
1Institute for Occupational Medicine, University Munich, Germany.
The Science of the Total Environment
|April 5, 1996
Summary
Airborne platinum levels in Munich buses were measured. Higher platinum concentrations were found on routes with heavy traffic compared to suburban routes.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Public Health
Background:
- Air quality inside public transportation is a growing concern.
- Platinum group metals (PGMs) are emitted from vehicle exhausts.
- Understanding exposure levels in enclosed spaces like buses is crucial.
Purpose of the Study:
- To quantify airborne platinum concentrations in local buses in Munich.
- To compare platinum levels on different bus routes (urban vs. suburban).
Main Methods:
- Airborne platinum was sampled over 4-hour periods during regular bus rides.
- Adsorptive stripping voltammetry was used for precise platinum analysis.
- A detection limit of 0.5 pg/m3 was achieved with 5 m3 air sampling.
Main Results:
- The mean airborne platinum concentration across 96 samples was 7.3 pg/m3 (S.D. 6.5).
- Bus routes with the highest traffic density exhibited significantly higher platinum levels (33.0 pg/m3).
- Suburban bus routes showed considerably lower platinum concentrations (3.0 pg/m3).
Conclusions:
- Local buses can be sites of significant airborne platinum exposure for passengers.
- Traffic density is a key factor influencing indoor platinum concentrations in buses.
- Further research into PGM exposure in public transport is warranted.