Wei Hang, Sun Jian-Jun, Wang Yan-Min, Li Xiao, Chen Guo-Nan
Ministry of Education Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou, Fujian, China.
Analyst. 2008 Nov;133(11):1619-24. doi: 10.1039/b806750c. Epub 2008 Sep 4.
A disposable heated screen-printed carbon electrode (HSPCE) is successfully fabricated. It demonstrates rapid responses to electrical heating and is easily elevated above the water boiling point by a high frequency alternating current. The temperature rise at the HSPCE was found to be strongly dependent on the square of the heating current and the electrode width. Carbofuran (CAF) could be rapidly hydrolyzed to carbofuran phenol at the HSPCE with raised temperature, and then determined at the same electrode at room temperature by differential potential voltammetry (DPV). The factors influencing the detection were examined, including pH, hydrolytic temperature and heating time. Under the optimum conditions, the detection linear range of CAF was from 4.0 x 10(-7) to 4.0 x 10(-4) mol L(-1) and the detection limit was 5.0 x 10(-8) mol L(-1) (S/N = 3). This method was successfully applied to the analysis of CAF residues in real samples (spiked water, soil and vegetables), and satisfactory recoveries were obtained.
成功制备了一种一次性加热丝网印刷碳电极（HSPCE）。它对电加热显示出快速响应，并且通过高频交流电很容易升高到水的沸点以上。发现HSPCE处的温度升高强烈依赖于加热电流的平方和电极宽度。在温度升高的HSPCE上，克百威（CAF）可快速水解为克百威酚，然后在室温下于同一电极上通过差分电位伏安法（DPV）进行测定。研究了影响检测的因素，包括pH值、水解温度和加热时间。在最佳条件下，CAF的检测线性范围为4.0×10⁻⁷至4.0×10⁻⁴mol L⁻¹，检测限为5.0×10⁻⁸mol L⁻¹（S/N = 3）。该方法成功应用于实际样品（加标水、土壤和蔬菜）中CAF残留的分析，并获得了满意的回收率。
