Problems of the voltammetric on‐line determination of iron and sulfur in industrial glass melts

Abstract For some years efforts have been made in order to utilize voltammetric methods for glass technology. Different boundary conditions and the specific use as an analytical tool lead to some particular requirements in industrial application. For industrial use the electronic equipment has to be protected against electronic perturbation due to electric boosting. In order to shelter the control devices against dust and heat, these devices must be installed at quite a distance from the investigated glass melt, which gives rise to disturbances in the measured voltammograms. The most important problem is the fixing of the area of the measuring electrode, which varies due to glass level variations. The identification of the different influences and some solutions will be presented. In order to take also the influence of different glass compositions into account, the measuring setup should be calibrated for each particular glass melt. If all influences on the measured signal are known, a single point will be sufficient in order to calibrate the system.