The promising substitution of cyanide by EDTA as chelating agent in brass electrodeposition has been evaluated by many researchers in the last few years. This is very interesting for treating the effluent generated, since the presence of EDTA facilitates the recovery of the metals using electrodialysis, for example. Hence, using chronopotentiometry, our aim was to investigate the transport properties of the chelates involved in the potential treatment by electrodialysis of the effluent generated in the free-cyanide brass electrodeposition. We assessed the limiting current density, ohmic resistance, plateau length, concentration polarization and the undesirable precipitate formation in function of the solution pH, Cu²⁺/Zn²⁺ proportion and EDTA/Cu²⁺ molar ratio using the anionic HDX200 membrane. The pH solution showed a strong relation with all the properties and under higher pH, precipitate formation by the curves behavior was verified. Besides, the precipitate formation was also observed for the lower proportion of Cu²⁺, while no unexpected behavior was verified for Cu²⁺ concentrations ≥ Zn²⁺. Finally, the EDTA concentration altered only the limiting current density, since similar typical chronopotentiograms and current-voltage curves were obtained. It was found that the better conditions of the effluent to be treated may be pH 9/10, Cu²⁺ proportion = 50% and EDTA/Cu²⁺ = 2.5.

在最近几年中，许多研究人员已经评估了用EDTA取代氰化物作为螯合剂在黄铜电沉积中的应用前景。这对于处理产生的废水非常有趣，因为EDTA的存在有助于例如使用电渗析法回收金属。因此，使用计时电位法，我们的目的是通过电渗析游离氰化物黄铜电沉积过程中产生的流出物来研究参与潜在处理的螯合剂的传输性质。我们根据溶液的pH，Cu ²⁺ / Zn ²⁺比例和EDTA / Cu ^2+来评估极限电流密度，欧姆电阻，平稳长度，浓度极化和不良的沉淀形成。摩尔比使用阴离子HDX200膜。pH溶液与所有性能都显示出很强的关系，并且在较高的pH下，通过曲线行为证实了沉淀物的形成。此外，在沉淀形成也为Cu的比例较低观察²⁺，而没有意外的行为被证实对Cu ²⁺浓度≥的Zn ²⁺。最后，由于获得了类似的典型计时电位图和电流-电压曲线，因此EDTA浓度仅改变了极限电流密度。发现要处理的废水的更好条件可能是pH 9/10，Cu ²⁺比例= 50％和EDTA / Cu ²⁺  = 2.5。