杀草强在纳米SiO_2修饰碳糊电极上的电化学行为及其测定  

Determination of Amitrole on the Nano-SiO_2 Modified Carbon Paste Electrode

作　　者：姚秉华[1,2] 张磊[2] 赵青[2] 庞秀芬[2] 王骋[2] 

机构地区：[1]教育部西北水资源与环境生态重点实验室,陕西西安710048 [2]西安理工大学应用化学系,陕西西安710048

出　　处：《分析科学学报》2010年第5期513-516,共4页Journal of Analytical Science

基　　金：高等学校博士点学科基金(No.20096118110008);陕西省自然科学基金(No.SJ08B16);陕西省教育厅科研专项基金(No.09JK672);西安市科学计划项目(No.CXY09025)

摘　　要：制备了纳米SiO2修饰碳糊电极(Nano-SiO2/CPE),通过循环伏安法和示差脉冲伏安法研究了杀草强在Nano-SiO2/CPE上的电化学行为,建立了一种测定杀草强的电化学分析方法。在pH=3.0的0.2mol·L-1H3PO4-NaH2PO4缓冲溶液中,杀草强在Nano-SiO2/CPE上于+0.986V(vs.SCE)处产生一个灵敏的氧化峰。在最佳实验条件下,该氧化峰电流与杀草强浓度在5.0×10-6～1.0×10-3mol.L-1范围呈线性关系,相关系数为0.9993,检出限为2.0×10-7mol.L-1,回收率在92.0%～100.7%之间。实验证实,杀草强在电极上的氧化反应主要是受扩散控制的不可逆反应。Nano-SiO2 modified carbon paste electrode（Nano-SiO2/CPE）was prepared,and the electrochemical behavior of amitrole on Nano-SiO2/CPE was studied by cyclic voltammetry and differential pulse voltammetry.In the buffer solution of 0.2 mol5L-1 H3PO4-NaH2PO4（pH=3.0）,a sensitive oxidation peak of amitrole was observed at ＋0.986 V（vs.SCE）,and linear relationship between oxidation peak current and concentration of amitrole was obtained in the range from 5.0×10-6 mol5L-1 to 1.0×10-3 mol5L-1 with the correlative coefficient（R2）of 0.9993 and detection limit of 2.0×10-7 mol5L-1.Six determinations of amitrole with a electrode for the concentration level of 1.0×10-4 mol5L-1 were made to test precision,giving a relative standard deviation of 1.3%.The recovery for the spiked sample was in the range of 92.0%~100.7%.It was shown that the oxidation of amitrole is an irreversible process controlled mainly by diffusion.

关 键 词：伏安法 修饰电极 修饰碳糊电极 纳米SIO2 杀草强 

分 类 号：O657.15[理学—分析化学]