摘要
制备了十六烷基三甲基溴化铵(CTAB)改性钠基蒙脱土修饰电极,用循环伏安法研究了百草枯在该修饰电极上的电化学行为。结果表明,该电极过程受扩散控制。计算了电极过程的部分动力学参数:电极的有效面积Aeff=2.108mm2,百草枯在缓冲溶液中的扩散系数D=5.73×10-4cm2/s。用方波溶出伏安法优化了测定参数,测定了浓度与峰电流的线性关系,发现峰电流与百草枯浓度在9.660×10-7～3.865×10-4mol/L范围内呈线性关系,检测限为3.297×10-7mol/L,测定了实际水样中百草枯的含量,增敏回收率为94.55%～108.25%。
Hexadecyltrimethylammonium bromide （ CTAB ） modified clay （ CTAB-NaMM ） electrode was made. The electrochemical behavior of paraquat （PQ） was studied by cyclic vohammetry and the process was controlled by diffusion. The important electrochemical parameters including the effective area of CTAB-NaMM- CMC/GCE Aeff = 2. 108 mm^2, and the diffusion coefficient D = 5.73× 10^ -4 cm^2/s was calculated. The correlation between the peak current and concentration was studied by square wave stripping vohammetry（SWSV）. From the results we can find a good linearity between the peak current and concentration of PQ in a range of 9. 660× 10^ -7 _ 3. 865 × 10^ -4 tool/L, and its detect limitation was 3. 297 × 10^ -7 mol/L. The content of PQ in real water was detected by means of SWSV with a spiked recovery rate of between 94. 55% and 108. 25% for ipal.
出处
《应用化学》
CAS
CSCD
北大核心
2009年第7期816-821,共6页
Chinese Journal of Applied Chemistry
基金
四川省教育厅重点科研资助项目(2004A106)
关键词
蒙脱土
CTAB
百草枯
电化学行为
方波溶出伏安法
montmorillonite, CTAB, paraquat, electrochemical behavior, square wave stripping vohammetry
