牛磺酸席夫碱修饰铜电极循环伏安法测定过氧化氢
Cyclic Voltammetric Determination of Hydrogen Peroxide with Taurine Schiff Base Modified Copper Electrode
-
摘要: 在含有0.027 g·L-1邻氧乙酸苯甲醛缩牛磺酸席夫碱的1 mol·L-1氢氧化钠溶液中,于-1.2~0.6 V(vs.SCE)电位下,在铜电极表面电沉积一层邻氧乙酸苯甲醛缩牛磺酸席夫碱膜,制得邻氧乙酸苯甲醛缩牛磺酸席夫碱修饰铜电极。采用扫描电镜对电极表面的性能进行了表征,以循环伏安法对其电化学性能进行研究。试验发现:在pH 6.5的磷酸盐缓冲溶液中,在电位-0.18 V处,修饰电极对过氧化氢具有良好的催化性能,还原峰电流与其浓度在2.576×10-3~1.288×10-2mol·L-1范围内呈线性关系,检出限(3σ/k)为4.36×10-5mol·L-1。方法用于河水、湖水和下水道污水中过氧化氢的测定,并进行加标回收试验,回收率在98.7%~105%之间,测定值的相对标准偏差(n=5)在1.3%~4.9%之间。Abstract: The modified electrode was prepared by electrodeposition of a film of o-oxy-acetate-benzaldehyde-taurine Schiff base on the surface of copper electrode at the potential range from -1.2 V to 0.6 V (vs.SCE) from a 1 mol·L-1 NaOH solution containing 0.027 g·L-1 o-oxy-acetate-benzaldehyde-taurine Schiff base. The surface property of the modified electrode was studied by scanning electron microscopy, and its electrochemical property studied by cyclic voltammetry. It was found that the modified electrode showed effective catalytic property to H2O2 at -0.18 V in PBS of pH 6.5. Linear relationship between values of reductive peak current and concentration of H2O2 was obtained in the range of 2.576×10-3-1.288×10-2mol·L-1, with value of detection limit (3σ/k) of 4.36×10-5mol·L-1. The proposed method was used for the determination of H2O2 in water samples from river, lake and sewer, giving values of recovery found by standard addition method in the range of 98.7%-105% with RSD′s (n=5) in the range of 1.3%-4.9%.
下载: