高次谐波示波计时电位法  

High Order Harmonic Oscillographic Chronopotentiometry

作　　者：郑建斌[1] 朱俊杰[2] 胡娟[2] 高鸿[2] 

机构地区：[1]西北大学化学系,西安710069 [2]南京大学化学系

出　　处：《分析化学》1994年第7期748-751,共4页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金资助课题

摘　　要：本文提出了高次谐波示波计时电位法。E-t、dE/Dt-t曲线的二次或三次谐波信号可以利用由双T滤波器构成的选频放大器获得。谐波幅值使用万用表测量。讨论了直流电流大小和溶解氧对高次谐波幅值的影响。实验结果表明,谐波示波图的重现性良好,谐波幅值与去极剂浓度间有线性关系。A new electroanalytical technique, high order harmonic oscillographic chronopo-tentiometry ,is presented. The second and third harmonic signal of E-t or (dE)/(dt)-t curves can beeasily obtained by using a frequency selective amplifier which is consisted of twin-T filter network. The harmonic amplitudes are measured by using multimeter. The effect of direct current and dissolved oxygen on the harmonic amplitudes is discussed. The experimental results show that repeatability of the harmonic oscillogram is good, also the linear relationship between the harmonic amplitudes and concentration of depolarizer is good. The method is very useful in actual analysis.

关 键 词：高次谐波示波计时电位法 

分 类 号：O657.1[理学—分析化学]