Abstract
The accumulation of cadmium from sea water by marine invertebrates has been studied. Chelation of Cd with ethylenediaminetetraacetic acid (EDTA) was reported to double the rate of Cd uptake and the final tissue concentration in mussels. The physicochemical properties of Cd and Zn are similar and it has been suggested that the two elements are biologically antagonistic. When both Cd and Zn are present, the level of Cd is reduced in polychaete worms and bivalve molluscs. In contrast, the level of Cd remained fairly constant for most tissues of P. montagui exposed to Cd at a constant level and to Zn at different levels. Because of the contrasting results concerning the effects of Cd and Zn combined, and of chelated Cd, this study was undertaken to determine if exposure to Cd and Zn in combination affects uptake and excretion of either element by the deposit-feeding mollusc, Macoma balthica. In addition, the effects of Cd complexed with EDTA and the chemical form of Cd on uptake of Cd in M. Balthica were examined.
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