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ヨウ素の不活性ガス中拡散係数測定試験(II)

A Study of iodine diffusion in rare gases(II)

佐川 憲彦*

Sagawa, Norihiko*

ヨウ素蒸気を赤熱したフィラメント上で電離させ、これを正電位を与えたコレクターで捕集するイオン化センサーを試作し、これを用いて希ガス中のヨウ素をオンライン計測して、その特性を測定した。気化器中でヨウ素結晶からヨウ素蒸気を発生させ、ヨウ素蒸気を希ガスで搬送してセンサーに導いた。センサーのイオン電流を連続測定し、センサーを通過したヨウ素蒸気を苛性ソーダ水溶液中に捕集して、化学分析によりヨウ素を定量した。イオン化センサー出力の時間積分値とヨウ素捕集量とを比較した結果、ステンレス鋼コレクターを用いたセンサーでは、出力の時間積分値とヨウ素捕集量の間には相関が見出せないが、白金コレクターを用いたセンサーでは、両者の間に直線関係が認められた。

An ionization sensor. which ionizes iodine vapor on a heated filament and collects ionized iodine on a collector at positive potential, was made on an experimental basis. Iodine vapor in rare gas was determined with using the sensor on the line and the characteristic of the sensor was examined. Iodine vapor was generated from iodine crystals in an iodine evaporator and transferred to the sensor with carrier-rare gas. The iodine vapor was continuously monitored by the sensor and trapped in solution of sodium hydroxide. The amount of iodine in the solution was determined by chemical analyses. The integrated value of ion current was compared with the collected amount of the iodine. A proportional relation is observed between the collected amount and the integrated value obtained from the sensor with a platinum collector, but not found between the amount and the value obtained from the sensor with a stainless steel collector.

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