静止溶液中吸附富集时球状电极上的吸附量及可逆电流方程式

Amount Adsorbed and Reversible Adsorptive Current Equation in the Adsorptive Accumulation at a Symmetric Spherical Electrode in a Quiescence Solution

本文导出了强吸附条件下静止溶液中吸附富集时对称球状电极上的吸附量及线性变势吸附伏安法中可逆过程的电流方程式.结果表明,在吸附伏安法的实验条件下,其吸附量及吸附电流与电极半径及吸附富集时间呈非简单的幂函数关系,但与被吸附物溶液中的浓度有线性关系.利用吸附量或吸附电流与电极半径及吸附富集时间的关系可以求得未知体系的D_0值.用悬汞电极以1mol/L NaAc-HAc-1-羟基蒽醌体系对方程进行了验证,理论与实验结果相一致.

The equations for the amount adsorbed and reversible adsorptive current during an adsorptive accumulation at a symmetric spherical electrode in a quiescence solution under the condition of strong adsorption have been derived and discussed.Under usual experimental conditions of adsorption voltammetry, the relationships of the amount adsorbed Γ(ta) and adsorptive current ip with the radius of the electrode ro and adsorptive accumulation time ta are very complex, but the concentration of test substance is in linear relationship with Γ(ta) and ip. The value of Do of unknown substance can be calculated by the slope of Γ(ta)·ta-1/2～ta or iP·ta-1/2～ta curve- The equations have been verified experimentally by a HMDE in the solution of 1 mol/L NaAc-HAc-1-hydroxyanthra-quinone.