杀螟硫磷在离子液体修饰预处理玻碳电极上的电化学行为及测定

Electrochemical behavior and determination of fenitrothion on ionic liquid modified glassy carbon electrode

采用滴涂法制备了离子液体(IL)修饰预处理玻碳电极(IL/PGCE),建立了一种用于高效检测杀螟硫磷(FNT)的方法。利用循环伏安法(CV)对IL/PGCE进行了表征;通过方波伏安法(SWV)研究了杀螟硫磷在修饰电极上的电化学行为,并利用扫速研究了杀螟硫磷在IL/PGCE上的反应过程;讨论了pH值、预处理电位和时间、修饰剂含量、富集电位和时间等影响传感器性能的重要参数。在最优条件下,修饰电极对杀螟硫磷展现出较好的电化学响应,在0.001~1μg·L^(-1)和1~100μg·L^(-1)的范围内,峰电流与杀螟硫磷浓度之间呈现良好的线性关系。该方法具有较好的重现性和抗干扰能力,能够用于实际样品中杀螟硫磷的检测,样品回收率为89.6%~125.5%。

An ionic liquid(IL)modified pretreated glass carbon electrode(PGCE)was prepared by drip-coating method for rapid and sensitive detection of fenitrothion.The modified electrode was characterized by cyclic voltammetry(CV),the electrochemical behav-ior of fenitrothion was investigated by square wave voltammetry(SWV),and the electrode reaction process of fenitrothion was dis-cussed according to scan rate study.The important parameters on sensor performance was studied such as pH,pretreatment potential and time,modifier content,accumulation potential and time.Under the optimal experimental conditions,the modified electrode showed good electrochemical response to fenitrothion.The peak current and concentration of fenitrothion exhibited two good linear relationships in the ranges of 0.001~1μg·L^(-1) and 1~100μg·L^(-1).The proposed method exhibited good reproducibility and anti-interference,and could be applied for the detection of actual samples with the sample recoveries of 89.6%~125.5%.