表面活性剂存在下吲哚-3-乙酸的伏安行为及其测定  

Voltammetric Behaviors and Determination of Indole-3-acetic Acid in the Presence of Surfactant

作　　者：瞿万云[1] 杨春海[1] 张喜[1] 王庆伟[1] 

机构地区：[1]湖北民族学院化学与环境工程学院,湖北恩施445000

出　　处：《湖北民族学院学报（自然科学版）》2007年第4期430-433,共4页Journal of Hubei Minzu University(Natural Science Edition)

基　　金：湖北省教育厅重点项目(D200629004)

摘　　要：采用循环伏安法、线性扫描伏安法、差分脉冲伏安法对吲哚-3-乙酸在乙炔黑电极上的伏安行为进行了研究.发现在pH7.5的磷酸盐缓冲溶液中,当有4.5×10^-5mol/LCTAB存在时,于＋0.60V左右产生一灵敏的氧化峰,该氧化峰的峰电流与吲哚-3-乙酸的浓度在2.0×10^-7mol/L到7.0×10^-6mol/L呈良好的线性关系,富集120 s后检出限为1.0×10^-7mol/L.1.0×10^-6mol/L吲哚-3-乙酸溶液平行测定10次的相对标准偏差（RSD）为4.2%.方法用于池塘水和土壤强化样品中吲哚-3-乙酸的测定,回收率96%-106%,相对标准偏差2.9%-4.8%.The voltammetric behaviour of indole - 3 - acetic acid （IAA） was investigated by cyclic, linear - sweep and differential -pulse voltammtry at acetylene black electrode. In 0.1 mol/L phosphate buffer （PB） solution of pH7.5 and in the presence of 4.5 ×10^-5mol/L CTAB ,the sensitive oxidation peak of IAA at 0.60 V （ vs. SCE） . The oxidation peak current is linear with the concentration of IAA in the range from 2.0×10^-7to 7.0 ×10^-6mol,/ L. The detection limit is 1.0 ×10^-7mol/L for 120s accumulation. The relative standard deviation （ n = 10） is 4. 2% for 1.0 ×10^-6mol/L IAA. The proposed method was applied to the analysis of IAA added to pond water and soil samples. The recoveries were in the range of 96% - 106% with relative standard deviations of 2.9% -4.8%.

关 键 词：表面活性剂 吲哚-3-乙酸 伏安测定 

分 类 号：O657.15[理学—分析化学]