PVP-GR/GCE电化学检测塑料制品中双酚A的研究
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国家自然科学基金资助项目(61703152),湖南省自然科学基金资助项目(2016JJ4010,2018JJ3134),株洲市 科技计划基金资助项目(201707-201806)


Polyvinylpyrrolidone-Graphene Composite Modified Glassy Carbon Electrode for Electrochemical Determination of Bisphenol A in Plastic Products
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    摘要:

    针对塑料制品中双酚A(BPA)检测问题,制备了聚乙烯吡咯烷酮-石墨烯复合膜修饰玻碳电极(PVP-GR/GCE)并建立了BPA的电化学检测方法。通过扫描电子显微镜对PVP-GR的形貌进行了表征;以循环伏安法分别对GCE、PVP /GCE、GR/GCE以及PVP-GR/GCE进行了电化学表征;采用二阶导数线性扫描伏安法研究了PVP-GR/GCE对BPA的电化学性能;对检测条件进行了优化,并在最佳检测条件下对该电化学检测方法的线性范围、检测限、重现性、再现性、稳定性、选择性以及样品加标回收率进行了研究。实验结果表明:PVP-GR仍具有GR的特有性能,且其在水溶液中的分散性优于GR;K3[Fe(CN)6]在PVP-GR/GCE上的氧化峰电流最大,即PVP的引入改善了GR的水溶性,使PVP-GR/GCE的电化学性能增强;BPA在PVP-GR/GCE的电化学响应较裸GCE明显增强;在最佳检测条件下,BPA的氧化峰电流与其浓度在0.01~0.40 μmol/L和0.40~60.00 μmol/L范围内呈良好的线性关系,检测限为8.0 nmol/L(信噪比为3),且该方法具有良好的选择性、灵敏度、重现性和稳定性,并成功被用于塑料制品中BPA的检测,回收率为97.3%~105.2%。

    Abstract:

    A electroanalytical method was proposed for the determination of bisphenol A (BPA) based on polyvinylpyrrolidone-graphene composite modified glassy carbon electrode (PVP-GR/GCE). Morphology and property of PVP-GR/GCE were examined by scanning electron microscopy and cyclic voltammetry. Electrochemical performance of PVP-GR/GCE for detection of BPA has been investigated by second-order derivative linear sweep voltammetry. The linearity range, detection limit, repeatability, reproducibility, stability, selectivity and sample adding standard recovery under the optimal condition were researched. The PVP-GR/GCE showed enhancement effect on the detection of BPA. Influencing factors including the amount of casted PVP-GR, pH of buffered solution, accumulation potential as well as time were optimized. The results showed PVP-GR was of the properties of GR, with the dispersibility in water solution better than that of GR; the oxidation peak current of K3[Fe(CN)6] was greatest in PVP-GR/GCE, which indicated the adding of PVP improved GR water solution, and enhanced the electrochemical property. Under optimal conditions, a linear relationship between concentration of BPA and response current was obtained in the range of 0.01~0.40 μmol/L and 0.40~60.00 μmol/L with the detection limit of 8.0 nmol/L (S/N:3). The PVP-GR/GCE exhibited good selectivity, sensitivity, reproducibility and high stability. The PVP-GR/GCE was successfully applied in the determination of BPA in real samples with the recovery of 97.3%~105.2 %.

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贺全国,刘晓鹏,邓培红,刘 军,李福枝,李广利. PVP-GR/GCE电化学检测塑料制品中双酚A的研究[J].包装学报,2018,10(3):8-15.

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  • 收稿日期:2018-03-02
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  • 在线发布日期: 2018-07-12
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