気体分離膜/半導体検出器を用いる水中の極微量溶存オゾンの連続測定法

概要

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A method for the determination of ultra-trace aqueous ozone, utilizing a membrane-separation process and a thin film semiconductor detector, is proposed. A double-tube system, with an inner tube of microporous poly (tetrafluoroethylene) (PTFE) (i. d. 2.0 mm, o. d. 2.8 mm, length 400 mm) and an outer tube of PTFE (i. d. 4.0 mm, o. d. 5.0 mm), is used as a separator to transfer aqueous ozone into a gas phase. The aqueous ozone sample was fed at a flow rate of 30 ml/min to the separation unit. Ozone permeates through the microporous PTFE tube and disperses into clean air flowing in the inner tube at a flow rate of 200 ml/min. The inner air flows through a Nafion permeation tube system in order to remove vapor in the sample air and flows onto the thin film semiconductor detector. Detection limit (S/N=3) was 0.12ppt. The relative standard deviation (n=10) was 5.1% at 1.0 ppm of ozone. The time to reach to a stable signal level was 4 min. The interference by inorganic ions, amino acids, proteins, humic acids, and ammonia was not significant.
社団法人日本分析化学会の論文
1989-07-05