A Generalized Description of Aquatic Colloidal Interactions: The Three-colloidal Component Approach

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• 作者：Jacques Buffle ; Kevin J. Wilkinson ; Serge Stoll ; Montserrat Filella ; and Jingwu Zhang
• 刊名：Environmental Science & Technology
• 出版年：1998
• 出版时间：October 1, 1998
• 年：1998
• 卷：32
• 期：19
• 页码：2887 - 2899
• 全文大小：327K
• 年卷期：v.32,no.19(October 1, 1998)
• ISSN：1520-5851

文摘

This paper describes several possible interactions amongthe different types of organic and inorganic aquaticcolloids, based on our present knowledge of their size,electric charge, and conformation. The physicochemicalproperties of the different groups of colloids are described.Emphasis is placed on the various types of organiccomponents, including fulvic compounds. Subsequently,the role of each colloid class is discussed with respect tohomoaggregation (aggregation within a given colloidclass) and heteroaggregation (aggregation among differentcolloid types). On the basis of a synthesis of literaturereports, microscopic observations of natural colloids,experimental results obtained with model systems, andnumerical simulations, it is concluded that the formationof aggregates in aquatic systems can be understood bymainly considering the roles of three types of colloids:(i) compact inorganic colloids; (ii) large, rigid biopolymers;and (iii) either the soil-derived fulvic compounds or theirequivalent in pelagic waters, aquagenic refractory organicmatter. In most natural aquatic systems, the small (fewnanometers) fulvic compounds will stabilize the inorganiccolloids whereas the rigid biopolymers (0.1-1 m) willdestabilize them. The concentration of stable colloids ina particular aquatic system will depend on the relativeproportions of these three components.