Study of the diffusion of metals and metals-EDTA complexes in water by capillary method

EDTA can complex with radionuclides (RNs) to form negatively charged complexes, making it difficult for clay minerals retard the diffusion of RNs waste. The coefficient in water ( D w ) is an important parameter safety assessment repository. In this study, effectsof on metal ions (Cu 2+ , Sm 3+ Nd Lu and Zn were investigated by a capillary method. experimental results showed that [Cu-EDTA] 2- [Sm-EDTA] - [La-EDTA] have higher thanthe Mn+. Whereas, [Nd-EDTA] [Zn-EDTA] lower than cations. consistent literatures, indicating validity method determine coefficients. According Stokes-Einstein relation, ionic radius potential ion are disproportional value. Cu-, Sm-and La-EDTA complexes smaller molecular size uncomplexed ions, M n+ might be associated many molecules hydrated larger radius. Whereas