研究了弗吉尼亚水库原水和凝结水中溶解有机碳（DOC）的分子大小、电荷和溶解度特征，以确定通过常规的凝结、沉淀和过滤处理顺序去除的有机化合物类型。最大的影响因素是DOC的分子量分布。硫酸铁混凝沉淀DOC取决于粒径，偏向于大分子。电荷是去除DOC的第二个因素，与中性化合物相比，离子化合物被选择性地去除。亲水性和疏水性有机物优先于中等溶解度的化合物被去除。富里酸是未经处理水中三卤甲烷和总有机卤化物的主要前体，因为它们含量丰富，比产率高，反应速度快。这些化合物很容易被凝结去除。处理水中的主要前体是低分子量中性化合物。 这些化合物不能通过凝聚沉淀。与黄腐酸相比，该前体基团具有更低的比产率和较慢的反应速率。包括43个参考文献、表格和图表。

Molecular size, charge, and solubility characteristics of dissolved organic carbon (DOC) in raw and coagulated water from a Virginia reservoir were investigated to determine the types of organic compounds removed by the conventional treatment sequence of coagulation, settling, and filtration. The largest factor was molecular weight distribution of the DOC. Precipitation of DOC by ferric sulfate coagulation was size-dependent, with a bias toward larger molecules. Charge was the secondary factor in DOC removal, with ionic compounds being selectively removed over neutral ones. Hydrophilic and hydrophobic organics were preferentially removed over compounds of intermediate solubility. Fulvic acids were the dominant precursors of trihalomethanes and total organic halides in untreated water because of their abundance, high specific yields, and fast reaction rates. These compounds were readily removable by coagulation. The dominant precursors in treated waters were low molecular weight neutral compounds. These compounds could not be precipitated by coagulation. Compared with fulvic acids, this precursor group had lower specific yields and slower reaction rates. Includes 43 references, tables, figures.