Platinum uptake by the freshwater isopod Asellus aquaticus in urban rivers

Platinum has been increasing in the environment as a result of emissions fr om catalytic converters. The platinum emitted is principally located in the vicinity of roads but might be transported to urban rivers through highway and urban run-off water. Platinum concentrations in the freshwater isopod Asellus aquaticus were measured for two urban rivers and a stormwater deten tion pond. Concentrations ranged from 0.04 to 12.4 mu g g(-1) for direct an alysis and from 0.16 to 4.5 mu g g(-1) after depuration. Analyses of water, pore water and sediments indicate that platinum in urban rivers is mostly found in the sediments and these provide the major contribution of platinum to Asellus aquaticus. Exposure experiments showed the importance of platin um speciation for uptake. (C) 1999 Elsevier Science B.V. All rights reserve d.