聚多巴胺修饰电极对痕量铅的测定研究  

Study of Trace Lead Determination by Polydopamine Modified Electrode

作　　者：张其美 赵晓娟[1] 胡少敏[1] 陈海光[1] 白卫东[1] 

机构地区：[1]仲恺农业工程学院轻工食品学院,广东广州510225

出　　处：《分析测试学报》2015年第8期962-965,共4页Journal of Instrumental Analysis

基　　金：广东省自然科学基金项目(S2013010013416);广东省教育厅项目(2012KJCX0068);广东省高等学校优秀青年教师培养计划资助项目(Yq2013097)

摘　　要：通过多巴胺（DA）的自聚反应在玻碳电极（GCE）表面修饰一层聚多巴胺（PDA）膜,对DA的自聚条件和方波溶出伏安法测试条件进行优化。优化的实验条件为：以2 mg/mL DA的Tris-HCl（0.01 mol/L,p H8.5）溶液为自聚溶液,自聚反应时间为2.5 h,铅的测试底液为0.1 mol/L HCl溶液,修饰电极在铅测试溶液中于-1.0 V富集300 s时,溶出峰的峰形好,且峰电流大。峰电流与铅浓度分别在0.1-1.0μg/L和1.0-10.0μg/L范围内呈良好的线性关系,检出限为0.016 5μg/L。实验结果表明,该聚多巴胺修饰电极制备简单、灵敏度高、成本低,可用于加碘盐、纯净水和自来水中痕量铅的测定。A polydopamine （PDA） modified glassy carbon electrode （GCE） was fabricated by self- polymerization of dopamine （DA） and was used to detect the trace lead in iodized salt, pure water and tap water. The experiment conditions of seE-polymerization of DA and square wave stripping voltammetry were optimized. The optimal conditions were as follows： self-polymerization solution： Tris - HCI（0. 01 mol/L, pH 8.5） containing 2 mg/mL DA; self-polymerization time： 2. 5 h; reaction medium of lead ： 0. 1 mol/L HCl solution; accumulation potential ： - 1.0 V ; accumulation time ： 300 s. The type of dissolution peak is good and the peak current is high under the optimal conditions. The peak current is proportional to concentration of lead in the ranges of 0. 1 - 1.0 μg/L and 1.0 - 10. 0 μg/L, with a detection limit of 0. 016 5 μg/L. The results showed that the new method introduced is simple, sensitive and low cost, and could be applied in the determination of trace lead in iodized salt, pure water and tap water.

关 键 词：聚多巴胺 修饰电极 方波溶出伏安法 痕量铅 

分 类 号：O657.1[理学—分析化学] O614.433[理学—化学]