流动注射双安培法测定苯胺  

Flow Injection Biamperometric Analysis of Aniline

作　　者：张君才[1] 许海菊[1] 郭晓莉[1] 

机构地区：[1]咸阳师范学院化学与化工学院,陕西咸阳712000

出　　处：《分析科学学报》2011年第6期739-742,共4页Journal of Analytical Science

基　　金：陕西省自然科学基础研究基金(No.2009JM2006)

摘　　要：应用苯胺在预阳极化的铂电极上的催化氧化过程,建立了流动注射双安培法直接检测苯胺的电化学新方法。在外加电压差为0.30V时,苯胺在预阳极化处理后铂电极上的和氧化铂在另一支铂电极上的还原为两个不可逆电极过程,在pH=9.94的碳酸钠-碳酸氢钠缓冲溶液中,苯胺的氧化电流与其浓度在4.0×10-6～1.0×10-4 mol/L范围内呈良好的线性关系(r=0.9900,n=9),方法检出限为2.0×10-6 mol/L。连续20次测定1.0×10-5 mol/L的苯胺溶液,测定值的相对标准偏差(RSD)为2.01%,常见离子均不干扰测定。方法用于模拟样中苯胺含量的测定,结果令人满意。Based on the catalyzed oxidation of aniline on anode electrode and the biamperometric principle of irreversible couple,an electrochemical detection method was established for aniline with flow injection biamperometry.The biamperometric detection was achieved by coupling the oxidation of aniline on one electrode and the reduction of platinum oxide on another electrode with 0.30 V voltage applied.In the Na2CO3-NaHCO3 buffer with pH=9.94,the oxidation current of aniline was linear with aniline concentration ranging from 4.0×10-6 to 1.0×10-4 mol·L-1.The detection limit was 2.0×10-6 mol·L-1 and the RSD was 2.01% with 20 times of repeated detection of 1.0×10-5 mol·L-1 aniline.The method was applied to simulated samples with satisfactory results.

关 键 词：苯胺 流动注射分析 双安培法 不可逆电对 

分 类 号：O657.1[理学—分析化学]