Sun Dong, Zhang Huajie
Department of Pharmacy, Wenzhou Medical College, Wenzhou 325000, PR China.
Department of Pharmacy, Wenzhou Medical College, Wenzhou 325000, PR China.
Water Res. 2006 Sep;40(16):3069-3074. doi: 10.1016/j.watres.2006.06.031. Epub 2006 Aug 8.
Herein, an insoluble acetylene black (AB) was dispersed into water in the presence of a special kind of surfactant: dihexadecyl hydrogen phosphate (DHP), resulting in a homogeneous and stable AB-DHP suspension. Thus, a novel AB-DHP composite film coated glassy carbon electrode (GCE) was fabricated via coating technology. Additionally, the electrochemical behaviors of 2-chlorophenol at bare GCE, DHP-modifed GCE, and AB-DHP modified GCE were investigated, respectively. Compared with the unmodified and DHP-coated GCE, the AB-DHP film-modified GCE significantly enhances the oxidation peak current of 2-chlorophenol, and thus greatly improves its determining sensitivity, suggesting that this new modified electrode has great potential in the determination of trace level of 2-chlorophenol. All the experimental conditions, which affect the electrochemical response of 2-chlorophenol, were studied. Finally, a sensitive and simple voltammetric method with a good linear relationship in the range 2.0 x 10(-7)-4.0 x 10(-5) mol/L, was developed. The detection limit of 2-chlorophenol was 5.0 x 10(-8) mol/L for 2 min accumulation (S/N = 3). This electrode was successfully applied to detect 2-chlorophenol in water samples.
在此，将一种不溶性乙炔黑（AB）在一种特殊的表面活性剂：磷酸二己酯（DHP）存在下分散于水中，得到均匀稳定的AB - DHP悬浮液。因此，通过涂覆技术制备了一种新型的AB - DHP复合膜修饰玻碳电极（GCE）。此外，分别研究了2 - 氯酚在裸玻碳电极、DHP修饰玻碳电极和AB - DHP修饰玻碳电极上的电化学行为。与未修饰和DHP涂覆的玻碳电极相比，AB - DHP膜修饰玻碳电极显著提高了2 - 氯酚的氧化峰电流，从而大大提高了其测定灵敏度，表明这种新型修饰电极在测定痕量2 - 氯酚方面具有巨大潜力。研究了所有影响2 - 氯酚电化学响应的实验条件。最后，开发了一种灵敏且简单的伏安法，在2.0×10⁻⁷ - 4.0×10⁻⁵ mol/L范围内具有良好的线性关系。2 - 氯酚在2分钟富集时的检测限为5.0×10⁻⁸ mol/L（S/N = 3）。该电极成功应用于检测水样中的2 - 氯酚。
