Transport numbers in different metal chloride solutions were estimated using the emf method for two ion-exchange membranes: Ionics CR67 HMR412 (cation-exchange membrane) and Ionics AR204 SXRA 7639 Union-exchange membrane). The cation-exchange membrane was found to work nearly ideally for NaCl and CaCl2solutions even at high concentrations, whereas deviation from ideality was seen for ZnCl2and CuCl2solutions. The anion-exchange membrane showed transport numbers for the anion around 0.95 for NaCl, CaCl2and ZnCl2solutions for the concentration range investigated. Electrodialytic desalting experiments taken as a simplified simulation of the eleetrokinetic decontamination method showed that it was possible to remove all ions in the simulated soil volume, with a sharp increase in the potential difference over the soil volume as a result, and that it was possible to control the metal content in the different solutions in the electrodialytic decontamination method.
Hansen, H. K., Ottosen, L. M., Laursen, S., & Villumsen, A. (1997). Electrochemical Analysis of Ion-Exchange Membranes with Respect to a Possible Use in Electrodialytic Decontamination of Soil Polluted with Heavy Metals. Separation Science and Technology, 2425-2444. https://doi.org/10.1080/01496399708000778