Elektrochemische Methode zur quantitativen und kontinuierlichen Bestimmung von Ozon in Gasgemischen |
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Authors: | Ch. Fabjan P. Bauer |
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Affiliation: | 1. Isotope Laboratories, Institutt for atomenergi, Kjeller, Norway
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Abstract: | The method is based on the measurement of the diffusion controlled limiting current obtained with the cathodic reduction of ozone according to O3 + 2H+ + 2e? → H2O + O2 in sulphuric acid. The electrolyte is vigorously mixed with the gas containing ozone and circulated through the electrolytic cell by the ascending gas flow operating as a gas-lift pump. The solution saturated with ozone moves along a cylindric electrode consisting of a smooth platinum foil in laminar flow. A constant potential is maintained at the electrode by means of a potentiostat in such a way, that the electrochemical reaction is proceeding under limiting current conditions. A lead anode of high capacitiy is used as a counter- and reference electrode. The current recorded continuously is directly proportional to the concentration of ozone in gas. |
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