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采用碳棒电极示波极谱阴极溶出法，测定了氨苄青霉素及其胶囊的含量。氨苄青霉素在０．３ｍｏｌ／Ｌ盐酸及１％甲醛的底液中，于－０．６５Ｖ（ｖｓ，ＳＣＥ）处有一灵敏的阴极溶出二阶导数峰。氨苄青霉素的浓度在２．０μｇ／ｍＬ～４０．０μｇ／ｍＬ范围内与峰电流（Ｉｐ″）呈良好的线性关系，回收率为９２％～１０６％，方法简单可靠。
The carbon rod electrode oscillopolarographic cathodic dissolution method was used to determine the content of ampicillin and its capsule. Ampicillin had a second derivative of cathodic dissolution peak at -0.65V (vs, SCE) in 0.3mol / L hydrochloric acid and 1% formaldehyde. Ampicillin concentration in the range of 2.0μg / mL ~ 40.0μg / mL peak current (Ip ") showed a good linear relationship, the recovery rate of 92% to 106%, the method is simple and reliable.