设计和组装了用于液相色谱的双工作电极电化学检测的薄层流通池和双恒电位控制器。控制器同时控制两个工作电极的电位,仪器灵敏、稳定,操作方便,可检测低至pA级的电流。研究了肾上腺素、多巴胺、对苯二酚和儿茶酚等四种物质的串型、并型双电极行为,在串型双电极中,四种物质的收集系数在0.24—0.34之间,可应用于定量分析测定。 A thin-layer flow cell and dual potentiostat for the electrochemical detection of dual working electrodes in liquid chromatography were designed and assembled. The controller controls the potentials of two working electrodes at the same time. The instrument is sensitive, stable and easy to operate. It can detect current down to pA level. The string-type and double-type bipolar behavior of four substances, epinephrine, dopamine, hydroquinone and catechol, were studied. The collection coefficients of the four substances in the series double-electrode were between 0.24-0.34. Applied to quantitative analysis.