塑料瓶中双酚A的电化学测定方法研究

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pH7．0的磷酸盐缓冲溶液（PBS）中，双酚A在0．504V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）。

Study on Electrochemical Determination of Biphenonl A in Plastic Bottle

The electrochemical behavior of bisphenol A（BPA） at a carbon paste electrode（CPE） modified with a multi-wall carbon nanotubes（MWCNTs） film was studied with cyclic voltammetry（CV）. Results showed that the MWCNTs- CPE had a strong electrocatalytic effect on BPA. In phospate buffer solution（PBS） of pH 7.0, BPA exhibited a significant oxidation peak at 0.504 V. Based on this, a sensitive electrochemical method was developed for the determination of BPA in plastic bottle. The experimental parameters, such as the pH of the supporting electrolyte, scan rate and accumulation time were optimized. The defferential pulse current of BPA was linear with its concentration in the range of 5.0 × 10^-7-2.0 × 10^-5 mol/L （ r=0.995 45 ）. The detection limit was 1.0 × 10^-7 mol/L at the signal-to-noise of 3. The established methods was applied to determine bisphenol A in plastic cup sample with recovery of 104.4%, and the RSD was 3.9%（n=6）.