辛可宁为一重要的喹啉类生物碱,分析应用也较多,目前尚无选择性电极报道。再者,迄今报道的离子选择性电极以固定价态离子居多,对可变价态离子的选择性电极未见详细研究。本文报道可以两种质子化状态存在的辛可宁的电极行为与特点,证明控制溶液的pH可使电极的线性响应斜率及检测灵敏度提高一倍,用此电极测定辛可宁,方法快,准确度较好。 Xin Ke Ning as an important quinoline alkaloids, analysis and application of more, there is no selective electrode reported. Furthermore, ion-selective electrodes so far reported in the majority of fixed valence ions have not been studied in detail for selective electrodes of variable valence ions. This paper reports the behavior and characteristics of cinchonine which can exist in two protonated states. It is proved that the pH of the control solution can double the slope of the linear response and the sensitivity of detection. The method of determination of cinchonine by this electrode is rapid and accurate.