2,4-二甲基苯胺印迹电极的零流电位法制备与应用
马明明,梁娟丽,苏新科
西安工程大学环境与化学工程学院,西安 710048
Preparation and application of 2,4-dimethylaniline imprinted electrode by zero current potentiometry
马明明,梁娟丽,苏新科
College of Environment and Chemical Engineering Xi'an Polytechnic University, Xi'an 710048, China
摘要:以电聚合方式,在石墨烯修饰的铅笔芯电极表面制备出2,4-二甲基苯胺的分子印迹聚合物,以零流电位
变化的最大差值为指标获得最佳电聚合参数。磷酸缓冲溶液的pH 为6.47,功能单体与模板分子的配比为1∶8,电位
范围为-0.8~0.8 V,聚合圈数为26,洗脱时间为5 min。与2,4-二甲基苯胺结构相近的物质如4-氯苯胺、4-氨基联苯、
联苯胺、邻甲苯胺等均不干扰测定。2,4-二甲基苯胺质量浓度的对数在0.121 2~605.908 μg/L 范围内与零流电位
线性关系良好,相关系数为0.991,检出限为0.040 6 μg/L。测定结果的相对标准偏差为0.84%(n=5),平均回收率为
95.59%~101.70%。该电极制备简单,灵敏度高,选择性和稳定性好,适用于实际废水中2,4-二甲基苯胺的检测。
Abstract:Molecularly imprinted polymers of 2,4-dimethylaniline(2, 4-DMA) were prepared on the surface of
graphene-modified pencil-core electrodes by electropolymerization. The optimum electropolymerization parameters were
obtained by the maximum difference of zero-current potential. The pH of phosphate buffer solution was 6.47, the ratio of
functional monomer to template molecule was 1:8, the potential ranged from -0.8~0.8 V, the number of polymerization
cycles was 26, and the elution time was 5 min. Substances similar to 2,4-DMA such as 4-chloroaniline, 4-aminobiphenyl,
benzidine, o-toluidine did not interfere with the determination. Logarithm of the mass concentration of 2,4-DMA was
linear with zero current potential in the range of 0.121 2-605.908 μg/L, the correlation coefficient was 0.991, and the
detection limit was 0.040 6 μg/L. The relative standard deviation was 0.84%(n=5), and the average recoveries were
95.59%-101.70%. The electrode has the advantages of simple preparation, high sensitivity, good selectivity and stability. It
is suitable for the determination of 2,4-DMA in wastewater.
关键词:2,4-二甲基苯胺;分子印迹聚合物;零流电位法;电聚合
Keywords:2,4-dimethylaniline; molecularly imprinted polymer; zero current potentiometry; electropolymerization
基金:陕西省科技攻关项目(2013kj07-24) ;西安市科技创新引领项目[201805030YD8CG14(15)]
本文引用格式:
马明明,梁娟丽,苏新科. 2,4- 二甲基苯胺印迹电极的零流电位法制备与应用[J]. 化学分析计量,2019,28(2):39-44.
MA M M,LIANG J L,SU X K. Preparation and application of 2,4-dimethylaniline imprinted electrode by zero current potentiometry[J].Chemical analysis and meterage,2019,28(2):39-44.
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