Abstract
AbstractChanges in the relative sizes of the carboxylic absorption bands in the infrared spectra (near 1730 and 1610 cm−1) of adsorbents before and after treatment with paraquat (1,1′‐dimethyl‐4,4′‐bipyridylium dichloride) showed that ion exchange is the predominant mechanism for adsorption of the bipyridyl by H+‐ ion saturated preparations of a humic acid from an organic soil, by two hydroquinone polymers and by two carboxylic ion‐exchange resins. Attempts to relate the extents of saturation (with adsorbate) of the exchange sites with the optical densities of the infrared bands were unsuccessful because of deviations from Beer's Law. Ultraviolet spectroscopy failed to provide evidence for charge transfer mechanisms in paraquat‐humic acid complexes in aqueous systems.
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