A theoretical model is developed for the electrokinetic method of removing contaminants and, in particular, radionuclides (existing in an immobile form) from soil. This method is based on the application of a steady electrical field to bulk soil placed between electrodes which ensures delivery of the corresponding ligands by the electromigration mechanism and subsequent removal of the charged complexes containing the contaminants which are produced. The analysis presented shows that the character of the cleaning process depends substantially on the ratio between the rates of the complex formation reactions and the rates of the ionic transport processes.