濃淡電池を利用する二酸化イオウの連続測定

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A new device for continuous determination of sulfur dioxide was presented, which consisted mainly of an iodine generator and a sensor. A solution of a generating medium was supplied to the generator at a constant flow rate and iodine was generated electrolytically with a constant current. Concentration of the iodine solution could be controlled by adjusting the flow rate and the electrolysis current. The sensor consisted of two half cells of iodine with a sintered glass membrane and the iodine solution flew through the membrane from the inner half cell to the outer. Two platinum wire electrodes were used and the outer electrode was placed in contact with the membrane. When sulfur dioxide re-acted with iodine in the outer half cell, the potential difference corresponding to the concentration ratio of iodine was observed. A sample gas involving sulfur dioxide was pumped in the sensor at a constant flow rate, and its concentration was determined from the observed potential difference. Five percent potassium iodide solution of pH 7.1 was chosen for the generating medium as the results of investigation on the stability and sensitivity of the electrode potentials. The potential difference vs. sulfur dioxide concentration was measured by using the gases of known concentration prepared by the permeation tube method. The calibration line was linear. With this simple device, up to 20ppm of sulfur dioxide could be determined and its detection limit was 0.5ppm.
社団法人日本分析化学会の論文

濃淡電池を利用する二酸化イオウの連続測定

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