卡可西灵在汞电极上的电化学行为和吸附特性

在ＨＡｃ－ＮａＡｃ底液中，卡可西灵在汞电极上有两个还原峰，第一峰峰电位Ｅｐｃ１＝０．０４Ｖ（ｖｓ．Ａｇ／ＡｇＣｌ），为２电子转移的可逆过程；第二峰峰电位Ｅｐｃ２＝－０．３９Ｖ，为４电子转移的不可逆过程，第二峰具有明显的吸附性。本文探讨了该吸附特性，认为吸附型体为中性分子，属于不可逆吸附体系。测得其电极反应动力学参数αｎα和卡可西灵在汞电极上的饱和吸附量，估计了每个卡可西灵分子所占的面积，建立了测定

The Electrochemical Behavior and Adsorptive Properties of Cacotheline at Hg Electrode

in a supporting electrolyte of HAc-NaAc, cyclic voltammetry of cacotheline showed two cathodic pobs at Hg electrode. The peak potentials of them were 0. 04V and-0. 39V(vs.AS/AgCl),respectively.The first Peak .represents a reversible process involving 2 electrons,while,the second is an irreversible process inchuding 4 elections. The second peak showed obvious adsorptive properties, which was discussed in detail in this paper. The adsorbed species was bly neutral cacotheline molecule. Under the conditions Of longer preconcentration time, smaller cacotheline concentration and faster scan rate, the reduedon of cacotheline We. almost toeflly controlled by adsotption. It this easel it belongs to the irrevendble adsorptive stystem. to value of an. and the saturated amount of cacotheline adsorbed on Hg surface were determined. The area occupied by each cacotheline molecule adsorbed was estimated. The method of determination of cacotheline by adsotptive stripping voltummetry was established.