摘要
CO_2电极响应过程受半透膜中CO_2扩散步骤控制,可用稳态模型描述之。电极理论动态响应为: 由该式研究了电极响应,回洗等问题,计算结果与实验相一致。深回洗后,电极对低浓度试样响应慢,对高浓度试样响应快,当C_ο~ο≤C_ο时,响应时间短:反之则长。本文还就怎样缩短测量周期,提高动态法测量精度和测量电极动力学参数DΛ/ll′逐一进行了讨论。
A dynamic differential equation of membrane diffusion, based on the steady state model, was proposed. The thermodynamic and dynamic specific properties of the electrode have been considered, and an interpretation was given out. The calculated values from the equation agree well with the experimental results; therefore it can be used to solve the problem of response rate and to determine the dynamic parameter of the electrode, The theory can also be used to explain the behaviour of the other gas sensing electrode with gas-permeable membrane.
关键词
二氧化碳
气敏电极
动态响应
carbon dioxide
electrode
dynamics response
gas sensing electrode
dynamics
