电化学分析法对食品包装材料中双酚A的检测

Electrochemical Determination of Bisphenol A in Food Packaging Materials

利用功能化单壁碳纳米管(SWCNT)修饰电极大的有效面积和较多的催化活性中心,研究双酚A(BPA)在该修饰电极上的电催化作用。结果表明:在pH6.5的磷酸盐缓冲溶液(PBS)中,于0.2V富集100s后,以扫描速度0.10V/s进行循环伏安测定,BPA的氧化峰电流(Ipa)与其浓度在2.0×10-8～3.5×10-5mol/L范围内呈良好的线性关系,检出限为8.0×10-9mol/L(RSN=3)。在进一步考察该修饰电极的稳定性、重现性和干扰实验的基础上,应用于食品包装材料中BPA含量的测定,回收率在97.5%～105%之间,结果令人满意。

Using large effective area and more catalytic active centers of the functionalized SWCNT modified electrode,we discussed the electrocatalytic activity of bisphenol A （BPA） on the modified electrode. Based on this investigation,an optimized electrochemical method was presented for the determination of this molecule in food packaging materials. The cyclic voltammetry was carried out at 0.10 V/s scanning speed after 100 s of accumulation in pH 6.5 PBS solution at 0.2 V voltage. The anodic peak current （Ipa） had good linear correlation with BPA concentration over the range from 2.0×10-8 to 3.5×10-5 mol/L. The detection limit of BPA was 8.0×10-9 mol/L （RSN = 3）. Moreover,the stability,repeatability and interference resistance of the modified electrode were investigated. This was followed by application evaluation of the developed method to the determination of BPA in four food packaging materials. Recoveries of BPA varying from 97.5% to 105% were obtained,indicating the excellence of this method.