フミン酸と銅との相互作用に関する分析化学的研究

概要

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The sensitive and simple methods for analysis of copper (II) ions in the presence of humic acids were developed by using dextran ton-exchanges and anodic stripping voltammetry with the addition of sodium dodecyl sulfate. These methods could be appied to the evaluation of copper (II) complexing abilities (conditional stability constants and complexing capacities) by accompanying with the two discrete binding-sites model. It was supported by the acid-base titration and IR spectra of humic acids that the carboxylic and phenolic hydroxyl groups were concemed with the copper(II) binding-sites in humic acids. A continuous stability distribution model was proposed which reflected the actual distribution of binding-sites in the humic molecule. The complexing abilities could be evaluated by non-linear least square curve fitting of experimental titration data to this model. Moreover, the associdtion coefficients between humic acids and copper (II)-oxinate could be evaluated, and it was found that the hydrophobic sites of humic acids were concerned with the binding of copper (II)-oxinate.
社団法人日本分析化学会の論文
1994-04-05