【摘要】 制备了聚乙烯吡咯烷酮-硫化镉（PVP-CdS）修饰金电极,用循环伏安法研究了替米考星在该修饰电极上的电化学行为,用差分脉冲伏安法测定替米考星。结果表明:在扫描速率为100mV·s^-1,静止时间为10s时,替米考星在pH 7.50的磷酸盐缓冲溶液中于0.93V左右产生一个氧化峰。PVP-CdS修饰金电极对替米考星的电化学过程有较显著的催化作用。替米考星的质量浓度在0.5³00mg·L^-1内与其在PVP-CdS金电极上对应的氧化峰电流呈线性关系,检出限为0.2mg·L^-1。以空白样品为基体进行加标回收试验,所得回收率为93.0%⁹7.5%,测定值的相对标准偏差（n=5）为2.7%⁴.1%。更多还原

【Abstract】 PVP-CdS modified gold electrode was prepared.Cyclic voltammetry was used to investigate the electrochemical behavior of tilmicosin at the modified electrode and differential-pulse stripping voltammetry was used for determination of tilmicosin.It was found that tilmicosin showed an oxidative peak at about 0.93Vin phosphate buffer solution of pH 7.50when the scanning rate was 100mV·s^-1 and the rest time was 10s.Significant catalytic action toward electrochemical process of tilmicosin was observed at PVP-CdS modified gold electrode.Linear relationship between values of oxidation peak current at PVP-CdS modified gold electrode and mass concentration of tilmicosin was kept in the range of 0.5-300mg·L^-1,with detection limit of 0.2mg·L^-1.On the base of blank sample,test for recovery was made by standard addition method;values of recovery found were in the range of93.0%-97.5%,with RSD′s（n=5）in the range of 2.7%-4.1%.更多还原