Many of the latest developments of the electrochemical soil remediation methods are
based on an increased acceptance that it may be beneficial or even necessary to vary the
remediation parameters depending on the soil characteristics and the actual pollution composition.
An example can be in the case of calcareous soils where the acidic front is developing
very slowly through the soil causing an unacceptable time demanding remediation. For remediation
of a Cu polluted calcareous soil, it is beneficial to add ammonia to the soil as complexing
agent prior to the remediation [5]. Meanwhile, the developing acidic front as catalyst
for heavy metal mobilization is very efficient in many soil systems and most papers reported
on electrochemical soil remediation is based on the development of this acidic front, including
the present paper. This paper investigates (I) whether there are differences in the relation
between pH and the mobility of Cu, Zn and Pb and (II) if the mobility and pH dependence
is soil-specific. The experimental basis for the work is 18 electrodialytic soil remediation
experiments performed with five different soils sampled at industrially polluted sites.