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本文以银丝汞膜电极为工作电极，在０．１０ｍｏｌ／ＬＮａＯＨ溶液中经１００℃水浴加热２０ｍｉｎ后，用线性扫描伏安仪制作ＣＥｘ的阴极还原曲线，其峰电位－０．７５Ｖ（ＶＳＡｇ／ＡｇＣｌ），浓度在２．０×１０－７～２．１０×１０－６ｍｏｌＬ－１；２．０×１０－６～２．０×１０－５ｍｏｌＬ－１范围内，峰高与浓度呈线性关系，其线性回归方程ｉ（格）＝１．２８６×１０６ｃ－０．１５０４（ｒ＝０．９９５８，ｃ：２．０×１０－５～２．０×１０－６ｍｏｌ／Ｌ）；ｉ（格）＝１．２３×１０６＋０．７８７０（ｒ：０．９９７３，ｃ＝２．０×１０－６～２．０×１０－７ｍｏｌＬ－１）．方法应用于胶囊中ＣＥｘ的含量测定并与药典法相比，结果基本一致．此外利用循环伏安等方法对其降解产物电化学行为进行初探，该体系属于准可逆吸附体系．
In this paper, mercury cathode electrode was used as the working electrode. The cathodic reduction curve of CEx was obtained by linear sweep voltammetry after the solution was heated in a solution of 0.10 mol / L NaOH at 100 ℃ for 20 min. The peak potential was -0.75 V (VSAg / AgCl) in the concentration range of 2.0 × 10-7 ~ 2.10 × 10-6molL-1 and 2.0 × 10-6 ~ 2.0 × 10-5molL-1, the peak height was linear with the concentration , The linear regression equation i (grid) = 1.286 × 106c-0.1504 (r = 0.9958, c: 2.0 × 10-5 ~ 2.0 × 10-6mol / L); i ) = 1.23 × 10 6 + 0.7870 (r: 0.9973, c = 2.0 × 10 -6 to 2.0 × 10 -7 mol L -1). The method was applied to the determination of CEx in capsules and compared with the pharmacopoeial method, the results were basically the same. In addition, cyclic voltammetry and other methods were used to study the electrochemical behavior of degradation products. The system belongs to the quasi-reversible adsorption system.