1. Method for voltammetric characterization of a liquid sample, using a voltammetric setup comprising at least two working electrodes (E 1 -E 4 ) and a counter electrode ( 30 ) that are placed in contact with the liquid sample ( 20 ), the method comprising the steps of: a. applying a first potential (P 1 ) on all working-electrodes (E 1 -E 4 ), b. performing a number of voltammetric cycles according to a predetermined pulse-sequence, each comprising the steps of: i. applying a second potential (P 2 ) on the counter electrode ( 30 ) according to the pulse-sequence, ii. performing a predetermined number of measurement procedures, each comprising the steps of: removing said applied first potential (P 1 ) from all but one of the working electrodes (E 1 -E 4 ), registering the current passing through the working electrode (E 1 -E 4 ) still having said first potential applied thereto, storing the registered value in a data storage unit ( 80 ), applying the first potential (P 1 ) on all working electrodes (E 1 -E 4 ), and c. analyzing said stored values using a predetermined mathematical model to produce a result.