アミン類に対するアンモニア気体感応電極の選択係数の濃度依存性

概要

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A theoretical analysis of the dynamic time response of a gas-sensing electrode is presented. The factors governing response time characteristics of the electrode are diffusions through both gas permeable membrane and internal film solution. The long response time of amine is due to considerable decrease in diffusion rate caused by chemical equilibration between amine and its conjugated acid in the internal film solution. The decrement of the apparent diffusion rate of amine is expressed by the product of the diffusion coefficient and the flux efficiency as defined by van der Pol. Based on this response time characteristic and Nikolsky-Eisenman's equation, a theoretical equation for the time- or concentration-dependent selectivity can be derived. The concentration-dependent change in experimental selectivity coefficients to trimethylamine is treated by applying the proposed equation. The result shows that the present approach provides a numerical prediction for the influence of interfering species on selectivity.
社団法人日本分析化学会の論文
1987-12-05