贵州民族大学 化学工程学院,贵州 贵阳 550025
杜海军,博士,教授,研究方向:电化学与储能材料,E-mail:hjdu51@163.com
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杜科志,杜海军,王世彬等.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(08):1213-1218.
DU Ke-zhi,DU Hai-jun,WANG Shi-bin,et al.Detection of Naphthoacetic Acid Using an Electrochemical Sensor Sensitivity-enhanced with Multi-walled Carbon Nanotubes[J].Journal of Instrumental Analysis,2021,40(08):1213-1218.
杜科志,杜海军,王世彬等.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(08):1213-1218. DOI: 10.19969/j.fxcsxb.20103102.
DU Ke-zhi,DU Hai-jun,WANG Shi-bin,et al.Detection of Naphthoacetic Acid Using an Electrochemical Sensor Sensitivity-enhanced with Multi-walled Carbon Nanotubes[J].Journal of Instrumental Analysis,2021,40(08):1213-1218. DOI: 10.19969/j.fxcsxb.20103102.
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SDBS-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。
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-MWCNTs composites were modified onto the surface of glassy carbon electrode(GCE) to construct a SDBS-MWCNTs/GCE electrochemical sensor. The electrochemical behaviors of naphthoacetic acid(NAA) on the electrode surface were investigated by cyclic voltammetry and linear scanning voltammetry. The experimental conditions, including concentration of SDBS, modification dosage of SDBS-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 detection of NAA in astragalus with recoveries of 97.8%-102% and RSDs less than 5%. The preparation of the sensor was simple, and the method had high sensitivity, good stability, reproducibility, and anti-interference ability.
萘乙酸(NAA)修饰电极电化学分析多壁碳纳米管(MWCNTs)
naphthoacetic acid(NAA)modified electrodeelectrochemical analysismulti-walled carbon nanotubes(MWCNTs)
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