HETEROGENEOUS CATALYTIC-OXIDATION OF S(IV) TO S(VI) BY MOLECULAR-OXYGEN - RAPID ACTIVITY DETERMINATION AS AN ANALYTICAL APPLICATION

The application of the chemical iodometric determination of S(IV) and of a physical conductometric method allows to determine the activity o f catalysts of biological origin (mainly manganese- and iron-contamina ted litter of pinus species). The discrete measurement permits the inv estigation of many samples within a short time. A comparison of the re sults of these two methods, which are based on different analytical pr inciples, allows to evaluate the results obtained by the conductivity method.