【摘要】 在有配位体存在的条件下.利用阳极溶出伏安法测得的水相游离金属含量通常偏高.本研究根据电化学、化学动力学和迁移动力学的基本原理,建立了描述扩散层中金属络合物解离反应和不同形态物质(游离态金属离子、游离态配位体和金属络合物)迁移过程中的物理模型和相应的数学模型 求得了稳态条件下该微分方程的近似解析解,结果表明,由于络合物在扩散层中的解离造成电极表面稳态富集通量增加是导致阳极溶出法测定结果正偏的根本原因更多还原

【Abstract】 Presence of natural occurring organic ligands may result in overestimation of free metal content by ASV technique. A conceptual model was developed. Both dissociation of the metal-ligand complex and mass transfer of various species within the diffusion layer were included in the model. The physical model was transformed into a mathematical one and the analytical solution to the differential equation at steady state were derived . The results of the mathematical modeling agreeed with those from computer simulation. The dissociation of the complex was proved by the modeling to be the primary reason causing the overestimation of free metal content.更多还原