This paper describes a sensor system for continuous on-line and in-line measurement of indigo and sodium dithionite concentrations during textile dyeing with indigo. The system is based on an electrochemical method, more specifically, multistep chronoamperometry. A repetitive sequence of potentials is applied at the surface of a platinum electrode, resulting in the oxidation of indigo and dithionite. The electrons released in these reactions are measured as an electrical current, and this signal is proportional with the concentra tions of indigo and dithionite. The platinum electrode is positioned in a so-called wall-jet electrode configuration in order to obtain time-independent electrode signals and a configuration that is relatively easy to implement in industrial dyeing lines. The system has potential industrial applications because of its fast response time (continuous mea surement), good reproducibility, acceptable precision and accuracy, and promising long- term stability.
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