Key Laboratory of Analytical Chemistry of the State Ethnic Affairs Commission, College of Chemistry and Materials Science, South-Central University for Nationalities, Minyuan Road, Wuhan, Hubei 430074, China.
Colloids Surf B Biointerfaces. 2011 Jan 1;82(1):40-5. doi: 10.1016/j.colsurfb.2010.08.011. Epub 2010 Aug 14.
A gold/sodium dodecylbenzene sulfonate nanoparticles modified glassy carbon electrode (nano-Au/SDBS/GCE) was electrochemically fabricated with a constant potential at -0.4V. The obtained nano-Au/SDBS/GCE was characterized with scanning electronic microscopy, X-ray photoelectron spectroscopy and electrochemical techniques. Electrochemical behaviors of methyl parathion at the nano-Au/SDBS/GCE were thoroughly investigated. Compared to the unmodified electrode, the peak current obviously increased and the oxidation peak potential negatively shifted. These changes indicated that the composite nanoparticles possess good electrocatalytic performance on the electrochemical reaction of methyl parathion. Experimental parameters such as deposition time, pH value and accumulation conditions were optimized. Under optimum conditions, the peak current corresponding to the oxidation of the hydroxylamine group was found in a good linear relationship with the methyl parathion concentration. In addition, a calibration curve with excellent linearity was obtained in the concentration range from 5.0×10(-7)molL(-1) to 1.0×10(-4)molL(-1) with an estimated detection limit of 8.6×10(-8)molL(-1) (S/N=3). The successful determination of methyl parathion in real samples demonstrated the usefulness and potential applications of this method.
采用恒电位法在-0.4 V 下制备了金/十二烷基苯磺酸钠纳米粒子修饰玻碳电极（nano-Au/SDBS/GCE）。采用扫描电子显微镜、X 射线光电子能谱和电化学技术对所得 nano-Au/SDBS/GCE 进行了表征。详细研究了纳米 Au/SDBS/GCE 上甲基对硫磷的电化学行为。与未修饰电极相比，峰电流明显增大，氧化峰电位负移。这些变化表明复合纳米粒子对甲基对硫磷的电化学反应具有良好的电催化性能。优化了沉积时间、pH 值和积累条件等实验参数。在最佳条件下，发现与羟胺基团氧化相对应的峰电流与甲基对硫磷浓度呈良好的线性关系。此外，在 5.0×10(-7)molL(-1)至 1.0×10(-4)molL(-1)的浓度范围内获得了具有优异线性的校准曲线，估计检测限为 8.6×10(-8)molL(-1)（S/N=3）。在实际样品中成功测定了甲基对硫磷，证明了该方法的有用性和潜在应用。
