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用一阶导数差示脉冲极谱法对异烟肼及其制剂进行了定量分析。在0.004mol／L邻苯二甲酸氢钾的水溶液中，于－1．060V（vsAg／AgCl）处出现一良好的一阶导数差示脉冲极谱峰，在20～120μg／ml范围内，药物浓度与其导数极谱峰幅值呈线性关系，检测限为8．6×10－7mol／L。方法简便、快速、灵敏，结果准确。
The first derivative differential pulse polarography was used to determine the isoniazid and its preparations quantitatively. In 0.004mol / L aqueous solution of potassium hydrogen phthalate, a good first derivative differential polarographic peak appeared at -1.060V (vsAg / AgCl). In the range of 20-120μg / ml, the drug The concentration and its derivative polarographic peak amplitude was linear, with a detection limit of 8.6 × 10-7mol / L. The method is simple, rapid, sensitive and accurate.