Sorption-Desorption of Ionogenic Compounds at the Mineral-Water Interface: Study of Metal Oxide-Rich Soils and Pure-Phase Minerals

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• 作者：Dharni Vasudevan ; Ellen M. Cooper ; and Oliver L. Van Exem
• 刊名：Environmental Science & Technology
• 出版年：2002
• 出版时间：February 1, 2002
• 年：2002
• 卷：36
• 期：3
• 页码：501 - 511
• 全文大小：171K
• 年卷期：v.36,no.3(February 1, 2002)
• ISSN：1520-5851

文摘

Sorption of the ionic compounds 2,4-D and quinmeraconto iron oxide-rich, variable charged soils was stronglyinfluenced by mineralogy, particularly soil iron and aluminumoxides, whereas sorption of the neutral norflurazon wasonly related to total soil C. An appreciable fraction of themass sorbed in stirred-flow studies was easily desorbedby deionized water, and desorption of ionic compounds wasinitially more rapid than sorption. This sorption-desorption behavior, although contrary to desorptionhysteresis commonly observed in batch studies, suggeststhat the reversibly sorbed fraction is weakly bound tothe soil surface. 2,4-D sorption to iron oxide-rich soils and pure-phase metal oxides appears to be driven by nonspecificelectrostatic attraction, with specific electrostatic attractionand van der Waals interactions being secondary. Boththe carboxylate and the heterocyclic N groups may participatein sorption of quinmerac, facilitated by specific andnonspecific electrostatic attraction and surface complexation.The heterocyclic N, amine, and carbonyl groups ofnorflurazon do not appear to interact with soil minerals.