选相示波伏安法

Phase-Selective A.C.Oscillovoltammetry

选相示波伏安法毕树平，都思丹，高鸿（南京大学化学系，２１０００８）关键词示波计时电位法，选相示波伏安法，切口示波计时电位法是利用ｄＥ／ｄｔ～Ｅ曲线上切口的高度或深度进行定量分析的方法［１］，但由于ｄＥ／ｄｔ曲线主要反映充电电流的变化，从而使该方法的检...

A new electrochemistry method ,phase-selective a.c.oscillovoltammetry,was developed in this paper.With the aid of the home-built instrument constructed by operational amplifiers,a reverse ladder-shape voltage was superposed onto the original dE/dt-t curve,therefore an oscillovoltammogram“i_f-E”was obtained,By selecting a suitable phase-angle between the ladder-shape voltage and the dE/dt-t curve,the incision on“dE/dt-E”oscillogram can be converted into a sharp peak on“i_f-E”curve.Experimental results showed that the peak height is a function of depolarizer concentration over a limited range of concentrations.The detection limit is 10￣(-6) mol/L,which is much better than that of“dE/dt-E”.