制备了氮掺杂石墨烯为修饰电极,对双酚A(BPA)进行了电化学检测。实验表明,BPA在+0.2~+O.8V扫描电位范围内,有一个不可逆的氧化还原峰出现。不同扫速的循环伏安行为发现,BPA的电化学氧化是一个由吸附控制的电极反应过程。BPA的浓度在4.0×10-8~4.0×10-8mol/L范围内与其氧化峰电流呈线性关系,检出限达到1.33×10-8mol/L(SIN=3)。该电极用于检测各种塑料中的BPA含量,回收率在95.93%~103.5%之间,结果令人满意。
A nitrogen-doped graphene (N-Rr) biosensor was modified glassy carbon electrode (GCE) and it has good electrocatalytic activity to electrooxidation of bisphenol A (BPA). The cyclic vohammogram (CV) of BPA on the modified electrode exhibits a well defined irreversible anodic peak and this oxidation signal was used to determine BPA. Under optimum conditions, the oxidation peak current was proportional to BPA concentration in the range of 4.0 x 104 to 4.0 x 10-8 mol/L and detection limit of 1.33 x 104 mol/L(S/N=3). The proposed method was successfully applied for detection of BPA in plastic products.