二酸化イオウ連続測定用濃淡電池の改良(ノート)

概要

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A concentration cell was applied as a novel sensor to the continuous determination of sulfur dioxide by the authors (this journal, 20, 828, 1971). Further improvements of the sensor were proposed to raise its sensitivity as follows. Fluctuation of the voltage reducing the sensitivity in the potentiometry had been caused by the pulse flow of the iodine solution applied by a pump into the sensor. The modified sensor succeeded in giving a constant flow of the solution as shown in Fig. 1, in which the flow rate could be regulated by the liquid height in the reservoir or the permeability of the glass membrane. The shape of the sensor was modified to improve the efficiency of the reaction of sulfur dioxide with iodine. The type III sensor was the most preferable. The optimum position of the working electrode was also given. By using the sensor type III, sulfur dioxide could be determined (the lower limit 0.07 ppm) under the following conditions; concentration of iodine solution, 0.3×10-8M (the generating current, 0.05 mA, the flow rate of generating medium, 0.6 ml/min); the drop rate of iodine solution from the sensor, 0.4 ml/ min; the flow rate of a sample gas, 500 ml /min.
社団法人日本分析化学会の論文