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以直径小于１００微米的毛细管作取样管，以负压和虹吸为动力将电极扩散层内的溶液吸取出来，采用电位法离线检测，通过测量电极扩散层内的Ｃｕ~（２＋）浓度，对各种取样方式进行了实验评价。获得阴极扩散层Ｃｕ~（２＋）浓度较本体溶液低３０％，阳极扩散层内Ｃｕ~（２＋）浓度较本体溶液高１６０％的结果，证明了方法的可行性，为毛细管电泳分析及其它分析方法测量扩散层内各物质浓度及形态建立了基础。
A capillary tube with a diameter of less than 100 μm was used as a sample tube. Negative pressure and siphon were used as a motive force to extract the solution in the electrode diffusion layer. The potential was measured offline. The Cu 2+ concentration in the electrode diffusion layer was measured, Sampling methods for experimental evaluation. The results showed that the concentration of Cu 2+ in the cathode diffusion layer was 30% lower than that in the bulk solution and the concentration of Cu 2+ in the anode diffusion layer was 160% higher than that of the bulk solution. The feasibility of the method was proved. The results were satisfactory for capillary electrophoresis and other analysis The method establishes the basis for measuring the concentration and morphology of each substance in the diffusion layer.