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基于多壁碳纳米管增敏的电化学传感器检测萘乙酸
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作者单位
杜科志,杜海军,王世彬,张 艳,李玉美 贵州民族大学 化学工程学院贵州 贵阳 550025 
基金项目:国家自然科学基金项目(81860701,82060714);贵州省普通高等学校“绿色化学与资源环境创新团队”项目(黔教合人才 团队字[2015]62);贵州民族大学自然科学基金(校科字(2019)1号)
中文摘要:该研究将多壁碳纳米管(MWCNTs)和十二烷基苯磺酸钠(SDBS)在水中超声 1. 5 h后,将复合物 SD? BS-MWCNTs 修饰至玻碳电极(GCE)表面,构建了用于检测萘乙酸的 SDBS-MWCNTs/GCE 电化学传感器。 利用循环伏安法和线性扫描伏安法考察了萘乙酸(NAA)在该电极表面的电化学行为,并考察了 SDBS 浓度、 SDBS-MWCNTs滴涂量及缓冲液pH值对萘乙酸信号的影响。在最优条件下(0. 5 mg/mL SDBS,5 μL SDBS- MWCNTs,pH 6. 0),采用差分脉冲伏安法(DPV)对不同浓度 NAA进行检测。结果显示,修饰电极的峰电流 强度与 NAA 浓度在 0. 4~45 μmol/L 范围内具有良好的线性关系,检出限为 0. 07 μmol/L。方法用于黄芪中 NAA的检测,回收率为97. 8%~102%,相对标准偏差(RSD)小于5. 0%。该传感器制备方法简单,具有较高的 灵敏度,良好的稳定性、重现性和抗干扰能力。
中文关键词:萘乙酸(NAA)  修饰电极  电化学分析  多壁碳纳米管(MWCNTs)
 
Detection of Naphthoacetic Acid Using an Electrochemical Sensor Sensitivity-enhanced with Multi-walled Carbon Nanotubes
Abstract:In this study, multi-walled carbon nanotubes(MWCNTs)and sodium dodecylbenzene sulfonate(SDBS)were ultrasonically oscillated in water for 1. 5 h,and the obtained SDBS-MW? CNTs composites were modified onto the surface of glassy carbon electrode(GCE)to construct a SD? BS-MWCNTs/GCE electrochemical sensor. The electrochemical behaviors of naphthoacetic acid (NAA)on the electrode surface were investigated by cyclic voltammetry and linear scanning voltam? metry. The experimental conditions, including concentration of SDBS, modification dosage of SD? BS-MWCNTs and pH value of buffer were optimized. Under the optimal conditions of 0. 5 mg/mL SDBS, 5 μL SDBS-MWCNTs and pH 6. 0, the sensor was used to detect different concentrations of NAA standard solution by differential pulse voltammetry(DPV). Result indicated that there was a good linear relationship between the peak oxidation current and NAA in the concentration range of 0. 4-45 μmol/L, and the detection limit was 0. 07 μmol/L. The sensor was applied to the actual de? tection of NAA in astragalus with recoveries of 97. 8%-102% and RSDs less than 5%. The prepara? tion of the sensor was simple, and the method had high sensitivity, good stability, reproducibility, and anti-interference ability.
Key Words:naphthoacetic acid(NAA)  modified electrode  electrochemical analysis  multi-walled carbon nanotubes(MWCNTs)
引用本文:杜科志,杜海军,王世彬,张 艳,李玉美.基于多壁碳纳米管增敏的电化学传感器检测萘乙酸[J].分析测试学报,2021,40(8):1213-1218.
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