3.5次微分循环示波计时电位法的研究

Investigation of 3 5th Order Differential Cyclic Oscillochronopotentiometry

将半积分半微分技术应用于循环示波计时电位曲线的处理，可大大抑制充电电流的影响，提高示波测定的灵敏度和分辨率．据此，本文提出了３．５次微分循环示波计时电位法，研究了该方法的特点并将其用于ＨＡｃ－ＮａＯＨ－铜铁试剂（ＨＣｕｐ）体系中铅示波特性的研究和微量铅的测定．

The semiintegral and semidifferential technology was applied to process cyclic oscillochronopotentiometric signal in this paper.The instrument of 3 5th order differential cyclic oscillographic chronopotentiometry has been designed. The experimental results of determination for Cd, In, Rh and Pb in pH=10 HAc NaAc 0 06% HCup solution show that the method has three advantages: (a) compared with the classifical oscillographic method based on d E /d t～E curve, the sensibility of the new method is increased about 5￣10 times; (b) better resolving power; (c) the peak height caused by depolarizer on Y 3 5 ￣E curve is easy to be measured. As a result, 3 5th order differential cyclic oscillographic chronopotentiometry will become a really feasible analytical method.