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Anodic stripping voltammetry of metal ions in mixtures of ligands

机译:配体混合物中金属离子的阳极溶出伏安法

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摘要

A model, originally developed for polarography of metal ions in mixtures of macromolecular and simple ligands, is extended to stripping voltammetric measurements carried out in such systems. Among other hypotheses, the model assumes excess of Ligand and absence of both electrodic adsorption and kinetic effects (complexes are supposed to be totally labile or totally inert). The different hydrodynamic conditions in stripping voltammetry in respect to polarography make it necessary to modify some equations of the original model. The reliability of this semiempirical approach is tested by studying the Zn-II + polymethacrylic acid + phthalate system, which is a typical system with labile complexation, The mean values of the formation constant and diffusion coefficient ratio obtained by this approach are quite similar to those determined from polarographic experiments. The introduction of a semiempirical hydrodynamic parameter p, analogous to that previously used in the model for a unique macromolecular complex, yields satisfactory results. [References: 26]
机译:最初开发的用于对高分子和简单配体混合物中的金属离子进行极谱分析的模型已扩展到在此类系统中进行溶出伏安法测量。除其他假设外,该模型还假设配体过量,并且没有电吸附和动力学效应(复合物应该完全不稳定或完全惰性)。溶出伏安法相对于极谱法的不同流体动力学条件使得有必要修改原始模型的某些方程式。通过研究Zn-II +聚甲基丙烯酸+邻苯二甲酸酯体系(该体系具有不稳定的络合物),对该半经验方法的可靠性进行了测试,该方法获得的形成常数和扩散系数比的平均值与这些方法非常相似。由极谱实验确定。半经验流体力学参数p的引入类似于先前在模型中用于唯一大分子复合物的参数,产生了令人满意的结果。 [参考:26]

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