L-(8-羟基-5-甲基喹啉)半胱氨酸修饰电极的制备及其对汞离子选择性检测  

Square Wave Voltammetric Detection of Mercury(Ⅱ)Based on L-(8-Hydroxyl-5-Methylquinoline)-Cysteine Sel-Assembled Monolayer Modified Gold Electrode

作　　者：杨梅[1] 吴菊[1] 谢成根[1] 

机构地区：[1]皖西学院材料与化工学院,安徽仿生传感与检测技术省级实验室,安徽六安237012

出　　处：《分析科学学报》2014年第3期437-440,共4页Journal of Analytical Science

基　　金：安徽省优秀人才基金(No.2012SQRL197);大学生创新创业训练计划(No.201210376010);国家自然科学基金(No.21201132);安徽省科技计划(No.1106c0805007;1206c0805031;1406C085021)

摘　　要：利用Shifft碱反应将L-半胱氨酸和5-甲酰基-8-羟基喹啉一步合成17（8-羟基-5～甲基喹啉）半胱氨酸，通过金-硫键将L-（8-羟基-5-甲基喹啉）半胱氨酸自组装到金电极表面制备L-（8-羟基-5-甲基喹eg）修饰金电极。L-（8-羟基-5-甲基喹啉）半胱氨酸分子中的羟基氧和氮可与Hg2＋^形成稳定的五元环配合物，因此该修饰电极能选择性吸附Hg”，结合方波伏安法用于Hg2＋^电化学检测。在0．01mol／LHCl中，富集时间为160S，Hg抖浓度在1．0X10-9^～1．0×10～mol／L、1．0X101～1．0X10-7mol／L浓度范围内与方波伏安峰电流分段呈现良好的线性关系，检出限为0．92×10mol／L。L-（8-hydroxyl-5-methylquinoline） cysteine was synthesized by the schiff base reaction and successfully immobilized on the gold surface. The modified electrode was successfully used to detect mercury ions based on the electrostatic interactions between the negatively charged hydroxyl and nitrogen on the electrode surface and Hg2＋. Therefore, Hg2＋ can be selectively and sensitively determined by using the square wave voltammetry. The response of voltammetry was linear to its concentration ranging from 1.0 × 10-9^ to 1.0 × 10-8^ and 1.0 ×10-8^ to 1.0 × 10-7^ mol/L with detection limit of 0.92× 10-9^ mol/L in 0.01 mol/L HC1 with a 160 s preconcentration.

关 键 词：L-(8-羟基-5-甲基喹啉)半胱氨酸 方波伏安法 汞离子 

分 类 号：O657.15[理学—分析化学]