锆-钙-茜素红异多核配合物在碳纳米管修饰电极上的阴极吸附伏安法行为及分析应用  

Cathodic Adsorptive Voltammetry of Zirconium-calcium-alizarin Red S Mix-polynuclear Complex at a Carbon Nanotube Modified Electrode

作　　者：邓培红[1] 张军[1] 黎拒难[2] 

机构地区：[1]衡阳师范学院化学与材料科学系,衡阳421008 [2]湘潭大学化学学院,湘潭

出　　处：《应用化学》2008年第6期722-725,共4页Chinese Journal of Applied Chemistry

基　　金：衡阳市科学技术局(2007KJ001);衡阳师范学院科学基金(07A19)资助项目

摘　　要：制备了碳纳米管修饰碳黑微电极，研究了锆-钙-茜素红异多核络合物在该电极上的阴极吸附伏安行为，提出了一种测定痕量锆的新方法。采用二阶导数线性扫描伏安法进行分析，在0．096mol／L乙酸-0．048mol／L邻苯二甲酸氢钾缓冲液（pH=3．8）中，络合物吸附在碳黑微电极表面，于-502mV（vs SCE）处产生1灵敏的溶出峰，峰电流与锆的浓度在6．0×10^-12-8．0×10^17mol／L范围内呈良好的线性关系,检出限（S／N=3）为4．0×10-12mol／L（富集时间180s）。用于岩矿样品中痕量锆的测定，结果满意。A new method for the determination of trace amounts of zirconium was described. A multi-walled carbon nanotube modified carbon black microelectrode was prepared and the cathodic adsorptive vohammetric behavior of the zirconium-calcium-alizarin red S （ARS） mix-polynuclear complex at the modified electrode was investigated. Via the second derivative linear sweep technique, it was found that in a buffer solution of 0. 096 mol/L acetic acid and 0. 048 mol/L potassium biphthalate （ pH = 3.8 ）, the complex adsorbed to the modified electrode, yielding one sensitive peak at -502 mV（vs SCE）. The peak current of the complex was linearly correlated with Zr（ Ⅳ ） concentration in a range of 6. 0 × 10^-12 - 8.0 × 10^-7 mol/L, and the detection limit was 4. 0 × 10^-12 mol/L（S/N =3 ） for 180 s accumulation. The method was applied to the determination of trace zirconium in ore samples and the results were satisfactory.

关 键 词：碳纳米管 修饰电极 阴极吸附伏安法 锆 

分 类 号：O657[理学—分析化学]