聚铬黑T修饰玻碳电极方波伏安法测定对羟基苯乙酮

Determination of p-hydroxyacetophenone at a glassy carbon electrode modified with poly( eriochrome black T) by square wave voltammetry

建立了铬黑T修饰玻碳电极方波伏安法测定对羟基苯乙酮（P．hyd）的电化学方法。运用循环伏安法在含有0．5mmol／L铬黑T的0．1mol／LNaOH溶液中制备聚铬黑T膜，并用扫描电镜、红外光谱、电化学阻抗等技术进行了表征。在pH4．5的磷酸盐缓冲溶液中，P—hyd在908mV（vs．SCE）处的峰电流与其浓度在1—160μmol／L范围内呈良好的线性关系，检出限0．15μmol／L（S／N=3），相对标准偏差小于2％。

A novel poly （efiochrome black T, PEBT） modified glassy carbon electrode was developed to determine p-hydroxyacetophenone （p-hyd） by square wave voltammetry （SWV）. A thin film of EBT was deposited on the surface of glassy carbon electrode in 0. 1 mol/L NaOH containing 0. 5 mmoL/L PEBT by cyclic voltammetry. Scanning electron microscopy, Fourier transform infrared spectroscopy and electrochemical impedance spectroscopy were carried out to characterize the film. SWV reveals an oxidation peak of p-hydat 908 mV（vs. SCE） whose current is linear in the range of 1 - 160 μmol/L in 0. 1 mol/L phosphate buffer solution （pH 4. 5） with detection limit of 0. 15 μmol/L （ S/N = 3 ）. The presented modified electrode has good anti- interference ability and stability. Furthermore, the relative standard deviations for both repeatability and reproducibility are less than 2%.