“门控制”效应分子印迹传感器测定绿麦隆

Chlortoluron Molecularly Imprinted Sensor Based on the "Gate Controlled" Effect

在氧化铂电极表面采用化学聚合法制得绿麦隆分子印迹膜传感器。利用"门控制"中"门"的数量变化控制催化性能的强弱,结合氧化铂对过氧化氢的催化放大效应,有效的提高了传感器的灵敏度并建立了对环境中绿麦隆残留的检测方法。研究了氧化铂电极对过氧化氢的催化效果,并对分子印迹膜聚合配比、过氧化氢浓度、洗脱时间、重吸附时间进行优化。在优化条件下,绿麦隆浓度在1.0×10^(-8)~8.0×10^(-6)mol/L范围内与氧化铂电极对过氧化氢的催化电流呈负相关性,检出限为5.4×10^(-9)moL/L。该传感器成功应用于农田水样的检测,其回收率为98.5%~102.0%。

A chlortoluron molecularly imprinted sensor was prepared on the surface of platinum oxide electrode through chemical polymerization.Gate’s change in the quantity of “gate-controlled” was utilized for manipulation of catalytic performance,combining with the catalytic amplification effect of platinum oxide on hydrogen peroxide.The sensitivity of sensor was improved effectively and the detection method for chlortoluron residue in environment was developed.In addition,the catalytic effect of platinum oxide electrode to hydrogen peroxide and the polymerization ratio of molecular imprinted membrane were studied.The hydrogen peroxide concentration,elution time and the re-adsorption time were optimized.Under the optimal conditions,the concentration of chlortoluron was negatively correlated with intensity of the catalytic current of platinum oxide electrode in the range of 1.0×10-8-8.0×10-6 mol/L,and the detection limit was 5.4×10-9 mol/L.The sensor was successfully applied in the detection of farmland water with recoveries of 98.5%-102.0%.