对硫磷分子烙印传感器的制备及应用  

Electrochemical Investigation of Parathion Imprinted Sensor and Its Application

作　　者：王成行[1] 李春涯[1] 徐秀灵[1] 李婷[1] 王长发[1] 

机构地区：[1]武汉大学化学与分子科学学院,武汉430072

出　　处：《应用化学》2006年第4期404-408,共5页Chinese Journal of Applied Chemistry

摘　　要：基于纳米TiO2液相沉积和分子烙印技术,以对特丁基杯[4]芳烃为功能单体制备了对硫磷分子烙印传感器.实验表明,pH=5.5的磷酸盐缓冲溶液中,对硫磷在该复合膜电极上产生1不可逆的还原峰（Ep=-0.706 V）和1对准可逆氧化还原峰（Ep=-0.067 2和-0.169 9 V）,氧化峰电流与对硫磷的浓度在5.0×10^-8～1.0×10^-5mol/L范围内具有良好的线性关系（r=0.996 5）,检出限为1.0×10^-8mol/L.并对几种结构与对硫磷相似的有机磷化合物进行了比较研究,结果表明,该传感器对对硫磷响应灵敏度和选择性最好.将此传感器用于蔬菜样品中对硫磷的测定及回收,结果比较满意.A parathion（PT） imprinted sensor was prepared on nano-TiO2 thin film by the liquid phase deposition method with p-tert-butylcalix[4] arene as the functional monomer. The experimental results indicate that PT gives an irreversible reduction peak（Ep = -0. 706 V） and a pair of reversible peaks（.Ep = -0. 067 2 V and -0. 169 9 V） in phosphate buffer solution（ pH =5.5）. The oxidation peak current increases linearly with the increase of the concentration PT in the range of 5.0 × 10^-8 to 1.0 × 10^-2 mol/L（r =0. 996 5）. The detection limit is 1.0 × 10^-8 mol/L. The selectivity of the imprinted sensors was also studied. It was found that the current responses of some similar compounds of parathion were much smaller than that of parathion. This method was applied in the determination of PT in some vegetables and a good recovery of added PT in the vegetable samples was demonstrated.

关 键 词：分子烙印传感器 对硫磷 纳米TIO2 微分脉冲伏安法 液相沉积 

分 类 号：O657.1[理学—分析化学]