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Abstract
This paper describes an industrial analyzer based on photochemical oxidation of organic substances present in water and on the measurement of released carbon dioxide by zero current potentiometry from a carbon dioxide sensitive electrode.
All apparatus functions are monitored by a microprocessor. A 100ml nonfiltered water sample is taken at regular intervals and the inorganic carbon is eliminated by the addition of phosphoric acid and bubbling with compressed filtered air. Peroxodisulfate is introduced and an UV irradiation is carried out. The materials in contact with the sample in the irradiation cell are solely Pyrex glass, quartz and PTFE. Refrigeration of sample is retarded so that oxidation can take place at a temperature greater than the ambient. Oxidation efficiency is close to 100% even for aminocompounds which are more difficult to oxidize.