Stable and Sensitive Amperometric Determination of Endocrine Disruptor Bisphenol A at Residual Metal Impurities Within SWCNT,Electroanalysis

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Stable and Sensitive Amperometric Determination of Endocrine Disruptor Bisphenol A at Residual Metal Impurities Within SWCNT
Electroanalysis ( IF 2.7 ) Pub Date : 2018-01-05 , DOI: 10.1002/elan.201700596
Pandiyaraj Kanagavalli ₁ , Shanmugam Senthil Kumar ₁

Affiliation

A simple and attentive method was attempted for the determination of endocrine disruptor molecule, Bisphenol A (BPA) using residual metal impurity act as a reactant present in as received SWCNT. The electrochemical behavior of BPA oxidation and its reaction mechanism was investigated by cyclic voltammetry using “as received SWCNT modified on glassy carbon electrode” (SWCNT/GCE) and the obtained results were compared with bare GCE. The SWCNT/GCE showed high electrocatalytic activity, sensitivity, stability and more importantly not much surface fouling compared with bare GCE. This is because of the formation of electroactive quinone and catechol as byproducts on SWCNT/GCE during electro‐oxidation of BPA. More interestingly, the electrochemically acid treated SWCNT/GCE not showed any characteristic oxidation and reduction peaks during electro‐oxidation of BPA which indicates that the presence of a residual metal impurity in SWCNT plays a vital role in electro‐oxidation of BPA. The amperometric detection of BPA oxidation on SWCNT/GCE showed excellent stability and good linear response from the wide range of concentration of 10–100 μM. The limit of detection and sensitivity of BPA electro‐oxidation on SWCNT/GCE is to be 7.3 μM (S/N=3) and 0.6494 μA/μM cm² respectively. Finally, the fabricated sensor using SWCNT/GCE was successfully applied for the detection of BPA in plastic water bottles with excellent recovery range from 98–102 %.

中文翻译：

稳定灵敏的安培法测定SWCNT中残留金属杂质下的内分泌干扰物双酚A

尝试了一种简单而专心的方法来测定内分泌干扰物分子，双酚A（BPA），使用残留的金属杂质作为原样存在的SWCNT中的反应物。采用“在玻碳电极上修饰的原样SWCNT”（SWCNT / GCE），通过循环伏安法研究了BPA氧化的电化学行为及其反应机理，并将所得结果与裸露的GCE进行了比较。与裸露的GCE相比，SWCNT / GCE显示出高的电催化活性，灵敏度，稳定性，更重要的是没有太多的表面污垢。这是因为在BPA的电氧化过程中，SWCNT / GCE上会形成副产物电活性醌和邻苯二酚。更有趣的是，经电化学酸处理的SWCNT / GCE在BPA的电氧化过程中未显示任何特征性的氧化和还原峰，这表明SWCNT中残留的金属杂质在BPA的电氧化中起着至关重要的作用。在10–100μM的宽浓度范围内，SWCNT / GCE上的BPA氧化安培检测显示出出色的稳定性和良好的线性响应。SWCNT / GCE上BPA电氧化的检测极限和灵敏度分别为7.3μM（S / N = 3）和0.6494μA/μMcm^2个。最终，使用SWCNT / GCE制成的传感器成功地用于检测塑料水瓶中的BPA，回收率极高，在98％至102％之间。

更新日期：2018-01-05

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