在这项研究中，评估了明矾和硫酸铁在去除四种低分子量化合物辛酸、水杨酸、苯酚和苯甲酸方面的效果——从密西西比河水和不含天然有机物的水样中。这些模型化合物的去除率在3%到20%之间，这与观察到的天然有机物<1K部分的去除率相似。溶液pH值影响芳香化合物的去除，但不影响辛酸的去除。 除苯甲酸外，在没有天然有机物的情况下，所有模型化合物的去除效果都更好。发现去除对混凝剂剂量相对不敏感。包括26个参考文献、表格和图表。

In this study, alum and ferric sulfate were evaluated for their effectiveness in removing four low-molecular-weight compounds octanoic acid, salicylic acid, phenol, and benzoic acid -- from Mississippi River water and from water samples free of natural organic matter. Removal of these model compounds ranged from between three and twenty percent, which is similar to the removals observed for the <1K fraction of natural organic matter. Solution pH affected the removal of the aromatic compounds but not of octanoic acid. Except for benzoic acid, all the model compounds were removed better in the absence of natural organics. Removal was found to be relatively insensitive to coagulant dosage. Includes 26 references, tables, figures.