Abstract
The cadmium transfer through and the retention of metal in perfused gills from rainbow trout ( Salmo gairdneri) has been studied in the presence of two Cd-complexing agents, ethylenediaminetetraacetic acid (EDTA) and citrate. The transfer and retention of Cd in the presence of EDTA was almost a function of the ambient free Cd 2+ activity. The transfer of the free Cd ion was about 1000 times higher than of the Cd-EDTA complex. The Cd-EDTA complex was to some extent retained in perfused tissue. The transfer of Cd in the presence of citrate was markedly greater than expected on the basis of the free Cd 2+ activity. The tissue retention of Cd was not affected by the presence of citrate. It is concluded that Cd uptake in fish gills in the presence of complexing agents is not simply a function of complexed versus free metal. The uptake is also profoundly dependent on the type of complexing agent present.
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