Voltammetric system for characterization of liquid sample, e.g. monitoring quality in food manufacture, has working electrodes, electrode selecting unit, counter electrode, current registration unit, data storage unit and processing unit

摘要

A voltammetric system comprises at least two working electrodes, a working electrode selecting unit enabling connection and disconnection of working electrode(s) to a first potential, a counter electrode connected to a second potential, a current registration unit arranged to control the second potential and working electrode selecting unit, a data storage unit, and a processing unit. A voltammetric system consists of: (a) at least two working electrodes (E1-E4); (b) a working electrode selecting unit enabling connection and disconnection of working electrode(s) to a first potential (P1), preferably zero volts; (c) a counter electrode (30) connected to a second potential (P2); (d) a current registration unit arranged to control the second potential and working electrode selecting unit, and to read current values from the current registration unit at predetermined points in time; (e) a data storage unit to store current values; and (f) a processing unit arranged to analyze the stored current values using a predetermined mathematical model, and to output the result from the analysis. An Independent claim is also included for voltammetric characterization of liquid sample (20) by applying first potential on all working electrodes and performing a number of voltammetric cycles according to a predetermined pulse-sequence. Each voltammetric cycle includes applying a second potential on the counter electrode according to the pulse-sequence; and performing a predetermined number of measurement procedures, each including removing the applied first potential from all but one of the electrodes, registering the current passing through the working electrode still having the first potential, storing the registered value in data storage unit, and applying the first potential on all working electrodes. The stored values are analyzed using a predetermined mathematical model to produce a result.