Abstract
Batch adsorption isotherms of fourteen dissolved organic matrices (DOMs) from river water, ground water, wastewater and commercial sources were measured using lumped quality indices of DOC and UV260, and analyzed using a distributed fictive component method. By accounting for the heterogeneity of DOM constituents with a log-normal distribution of Freundlich K, the adsorption equilibrium of each DOM was characterized by searching for only three parameters. Indicating strong adsorbability dependency upon the sources and types of DOMs, the distribution ranges of the Freundlich K differed markedly. Compared to a river water DOM that had a K range in 10.8–190 (mg/g)/(mg/l)1/n, a commercial humic acid was found most heterogeneous: K varied in 0.01–1494.3 (mg/g)/(mg/l)1/n. In addition, based upon chromatographic results measured using a HPSEC system for all DOMs before and after adsorption, preferential adsorption of small molecular weight constituents was revealed for commercial humic acids; for aquatic organic matrices, however, such a trend was not found.
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