二氧化碳和氧气的快速电化学方法联合测定

根据Ｏ２和ＣＯ２在二甲亚砜（ＤＭＳＯ）介质中Ｐｔ电极上的伏安特性，采用微电极并结构计算机控制的电位调制技术，建立了快速联合测定ＣＯ２和Ｏ２的调制电位脉冲库仑法和调制电位脉冲电流法，取得了满意的结果。一次测量时间快达４０ｍｓ。ＣＯ２检测范围０￣１０％（体积百分比）；Ｏ２检测范围不受限制。通过编程设计特定的调制电位－时间波形，可保持连续检测的长期稳定性。

Rapid Simultaneous Determination of Carbon Dioxide and Oxygen by Electrochemical Method

The voltammetric characteristics of O2 and CO2, in the presence of each other and the balance gas N2, were investigated at Pt microdisc electrode in dimethyl sulphoxide. Some of O2 - produced by the O2 reduction can react rapidly with the CO2 present in the aprotic solvent. Based on these observations. the modulated potential pulse coulometric and modulated potential pulse amperometric methods for rapid simultaneous determination of O2and CO2in gas mixture were developed. The periodically modulated potential-time waveforms were designed to maintain the electrode activity. Results show that this rapid electrochemical method is satisfactory in the aspects of accuracy, measurement time, detection range and long-term stability.