The invention relates to a process for the electrochemical determination and adjustment of the copper concentration in which: a) the copper concentration in the bath solution is found by cathodically depositing a proportion of the quantity of copper proportional to the copper concentration on an electrode, b) anodically detaching the separated quantity of copper, and c) measuring the charge quantity used for complete detachment, d) calculating the quantity of copper needed to set the copper concentration at a predetermined set value and the charge quantity needed to dissolve this quantity of copper anodically from a copper anode from the copper concentration found, and e) causing the calculated charge quantity to flow through an electric circuit which comprises the treatment solution as electrolytes and the copper electrodes immersed in the treatment solution as anodes. The individual steps in the determination and the adjustment may also be performed separately from one another.
