Zhao Dong-Ming, Zhang Xiu-Hua, Feng Li-Jun, Jia Li, Wang Sheng-Fu
Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan, PR China.
Colloids Surf B Biointerfaces. 2009 Nov 1;74(1):317-21. doi: 10.1016/j.colsurfb.2009.07.044. Epub 2009 Aug 8.
A poly-amidosulfonic acid and multi-wall carbon nanotubes composite (PASA/MWNTs) modified electrode has been constructed by electropolymerization on glassy carbon electrode (GCE). The electrochemical behaviors of hydroquinone (HQ) and catechol (CC) were investigated using cyclic and differential pulse voltammetries (DPVs) at the prepared electrode. Separation of the reductive peak potentials for HQ and CC was about 120 mV in pH 6.0 phosphate buffer solution (PBS), which makes it suitable for simultaneous determination of these compounds. In the presence of 1.0 x 10(-4)mol L(-1) isomer, the reductive peak currents of DPV are proportional to the concentration of HQ in the range of 6.0 x 10(-6) to 4.0 x 10(-4)mol L(-1), and to that of CC in the range of 6.0 x 10(-6) to 7.0 x 10(-4)mol L(-1). When simultaneously changing the concentration of both HQ and CC, the linear concentration range of HQ (or CC) is 6.0 x 10(-6) to 1.0 x 10(-4)mol L(-1) (or 6.0 x 10(-6) to 1.8 x 10(-4)mol L(-1)), and the corresponding detection limits are 1.0 x 10(-6)mol L(-1). The proposed method has been applied to simultaneous determination of HQ and catechol in water sample, and the results are satisfactory.
通过在玻碳电极（GCE）上进行电聚合构建了聚氨基磺酸与多壁碳纳米管复合材料（PASA/MWNTs）修饰电极。利用循环伏安法和差分脉冲伏安法（DPV）在制备的电极上研究了对苯二酚（HQ）和邻苯二酚（CC）的电化学行为。在pH 6.0的磷酸盐缓冲溶液（PBS）中，HQ和CC的还原峰电位分离约为120 mV，这使其适用于同时测定这些化合物。在存在1.0×10⁻⁴mol L⁻¹异构体的情况下，DPV的还原峰电流在6.0×10⁻⁶至4.0×10⁻⁴mol L⁻¹范围内与HQ浓度成正比，在6.0×10⁻⁶至7.0×10⁻⁴mol L⁻¹范围内与CC浓度成正比。当同时改变HQ和CC的浓度时，HQ（或CC）的线性浓度范围为6.0×10⁻⁶至1.0×10⁻⁴mol L⁻¹（或6.0×10⁻⁶至1.8×10⁻⁴mol L⁻¹），相应的检测限为1.0×10⁻⁶mol L⁻¹。所提出的方法已应用于水样中HQ和邻苯二酚的同时测定，结果令人满意。
