聚苯胺修饰电极-电化学氢化物发生原子荧光光谱法测定食品中锡含量

Electrochemical hydride generation atomic fluorescence spectrometry with a polyanline modified electrode for detection of tin

运用以聚苯胺修饰的石墨电极为阴极的电化学氢化物发生装置实现了锡元素的电化学氢化物发生。在电极表面聚合一层聚苯胺,能够有效地提高锡元素的电化学氢化物发生效率,通过与原子荧光光谱仪联用,成功地测定了食品中的锡含量。本工作对各种实验参数和干扰情况进行了详细研究。方法对锡的检出限为1.2 ng/mL(3σ);样品分析精密度(RSD)为2.3%(50 ng/mL,n=11)。

An electrochemical hydride generation （EC-HG） system with a polyaniline modified electrode （PAnME） as cathode material was developed for Sn （IV） determination by couped with atomic fluorescence spectrometry. The electrochemical hydride generation efficiency for Sn （IV） was improved evidently as the PAn membrane could obstruct the aggradation of Sn atom on cathode surface and facilitate the hydride generation. The effects of experimental parameters and interferences have been studied. The limit of detection （LOD） was 1.2 ng/mL （3σ） and the relative standard deviation （RSD） was 2.3% for eleven consecutive measurements of 50 ng/mL Sn （IV） standard solution.