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制备了多壁碳纳米管修饰碳糊电极(MWCNTs/CPE),用循环伏安法(CV)和差分脉冲伏安法(DPV)研究了环境激素双酚A在多壁碳纳米管修饰电极上的电化学行为。结果表明,多壁碳纳米管修饰碳糊电极对双酚A有明显的电催化作用,在pH 7.0的磷酸盐缓冲溶液(PBS)中,双酚A在0.504 V处有1个明显的氧化峰。实验考察了底液的pH值、扫描速度、富集时间等因素的影响。在优化的条件下,双酚A的示差脉冲峰电流与其浓度在5.0×10–7～2.0×10–5范围内呈良好的线性关系(r=0.99545),检出限为1.0×10–7mol/L(S/N=3)。该法用于实际样品中双酚A含量的测定,回收率为104.4%,测定结果的相对标准偏差为3.9%(n=6)。
Multiwalled carbon nanotubes modified carbon paste electrodes (MWCNTs / CPE) were prepared. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to investigate the effect of environmental hormone bisphenol A on multiwalled carbon nanotubes Electrochemical behavior. The results show that the multi-walled carbon nanotubes modified carbon paste electrode has a significant electrocatalytic effect on bisphenol A. In the phosphate buffer solution (PBS) at pH 7.0, bisphenol A has a significant oxidation peak at 0.504 V . The experiment investigated the pH of the bottom liquid, scanning speed, enrichment time and other factors. Under optimized conditions, the peak current of the differential pulse of bisphenol A showed a good linearity (r = 0.99545) with a concentration of 5.0 × 10-7 ~ 2.0 × 10-5 with a detection limit of 1.0 × 10-7mol / L (S / N = 3). The method was applied to the determination of bisphenol A content in real samples with a recovery of 104.4% and a relative standard deviation of 3.9% (n = 6).