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提出了多壁碳纳米管-聚亚甲基蓝(MWNT/PMB)复合膜修饰玻碳电极检测己烯雌酚(DES)的方法,考察了缓冲液、pH、扫描速度等实验参数对测定的影响。在0.2 mol/L的磷酸缓冲液(pH7.0)中,DES在复合膜电极上出现了一个明显的氧化峰,峰电位在0.197 V处。与裸电极相比较,修饰后的电极能显著提高DES的氧化峰电流并降低其氧化电位,表明MWNT/PMB复合膜对DES有电催化作用。峰电流与己烯雌酚浓度在3.73×10-11~3.73×10-8mol/L范围内呈线性关系,检出限为2×10-11mol/L;用此法对己烯雌酚药片的含量进行了测定,测定结果与标示相符。
A method for the determination of diethylstilbestrol (DES) by multi-walled carbon nanotube-poly (methylene blue) (MWNT / PMB) composite membrane modified glassy carbon electrode was proposed. The influence of experimental parameters such as buffer, pH and scanning speed on the determination was investigated. In 0.2 mol / L phosphate buffer solution (pH 7.0), DES showed a distinct oxidation peak at the composite membrane electrode with a peak potential of 0.197 V. Compared with the bare electrode, the modified electrode can significantly increase the oxidation peak current of DES and reduce its oxidation potential, indicating that the MWNT / PMB composite membrane has an electrocatalytic effect on DES. The peak current was linear with the concentration of diethylstilbestrol in the range of 3.73 × 10-11 ~ 3.73 × 10-8mol / L with the detection limit of 2 × 10-11mol / L. The content of diethylstilbestrol tablets was determined by this method. The result matches the mark.