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Platin aus Automobilabgaskatalysatoren

Umweltmedizinische Bewertung auf Basis neuer Expositions- und Wirkungsdaten
: Rosner, G.; Artelt, S.; Mangelsdorf, I.; Merget, R.

Umweltmedizin in Forschung und Praxis 3 (1998), Nr.5, S.365-375
ISSN: 1430-8681
Fraunhofer ITA ( ITEM) ()
Catalytic converters; environmental exposure; environmental health; environmental protection; environmental toxicology; platinum; platinum compounds; risk assessment; toxicity

We estimated ambient air concentrations of platinum by applying dispersion models as well as recent emission factors that have been derived from engine test bench experiments with three-way, monolith-type catalytic converters. Predicted concentrations in various exposure scenarios range from 4 pg/m3 (street canyon, typical conditions) up to 112 pg/m3 (express-motorway, severe conditions). These values agree well with the few measurements of platinum ambient air concentrations. Platinum es emitted from catalytic converters in very small amounts (ng/km range) and is mainly in the oxidation state 0 (elemental platinum). The nanocrystalline platinum particles are attached to microm-sized aluminium oxide particles. Whether free ultrafine platinum particles may be emitted and result in biological effects has not been studied sufficiently.