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Cette etude met en evidence la dispersion dans l'environnement routier et urbain francais des elements du groupe du platine (PGE) utilises dans les pots d'echappement catalytiques. On observe une differenciation entre d'une part Pt et Rh, dont les rapports sont coherents avec ceux presents dans les catalyseurs, et Pd de l'autre. Une experimentation consistant a faire passer, sur les metaux chauffes...