二茂铁修饰石墨粉-环氧树脂固态电极测定对苯二酚

Determination of p-Dihydroquinone by Cyclic Voltammetry with Ferrocene Modified Graphite-Epoxy Solid Electrode

在pH7．0（Na2HPO4-NaH2PO4）的0．5mol／L KCl溶液中，二茂铁修饰的石墨粉-环氧树脂固态电极上，对苯二酚给出较好的电化学催化行为。在优化实验条件下，建立了循环伏安法直接测定对苯二酚的痕量分析方法。在1．00～800μmol／L浓度范围内，对苯二酚阳极峰电流与浓度呈良好的线性关系，Ip（μA）=1．751＋0．1114c（μmol／L）（r=0．9953，SD=1．68），检出限为0．10μmol／L。方法简单、快速，直接用于污水中对苯二酚的检测，结果令人满意。

In pH 7.0 Na2HPO4 - NaH2PO4 buffer solution including 0. 5 mol/L KCl, p-dihydroquinone shows a electrocatalytic behavior on ferrocene modified graphite - epoxy solid electrode. Under the optimized experimental conditions, an electroanalytical method for determination of trace p-dihydroquinoe was established based on the electrocatalytic properties of the ferrocene modified electrode. The detection limit is 0. 10μmol/L with regression equation of Ip（μA） = 1. 751 ＋0. 111 4 c（μmol/L, r = 0. 995 4, SD = 1.68） in a concentration range of 1.00 - 800μmol/L. The method is simple and fast, and was applied to the detection of p-dihydroquinone in wastewater with satisfactory results （22.72 μmol/L）.