在模型淡水系统中进行了小试研究，以研究在氯化铁混凝过程中，各种参数如何影响砷的去除，以及在预成型含水氧化铁上吸附砷。参数包括砷的氧化状态和初始浓度、混凝剂用量或吸附剂浓度、pH值以及共存无机溶质的存在。混凝和吸附实验以及基于表面络合模型预测的实验结果对比表明，吸附是混凝过程中砷去除的一个重要（但不是唯一）机制。在类似条件下，在混凝和吸附实验中，观察到砷（V）[As（V）]比砷（III）[As（III）]的去除效果更好。在中性pH值以下，在硫酸盐存在下，As（III）去除吸附显著降低，而As（V）去除仅略有降低- 观察到吸附。在高pH值下，钙的存在增加了对As（V）的去除吸附。与As（III）相比，在三氯化铁混凝过程中去除As（V）的效率更高，对水源水成分变化的敏感性更低。包括34个参考文献、表格、图表。

Bench-scale studies were conducted in model freshwater systems to investigate how various parameters affected arsenic removal during coagulation with ferric chloride and arsenic adsorption onto preformed hydrous ferric oxide. Parameters included arsenic oxidation state and initial concentration, coagulant dosage or adsorbent concentration, pH, and the presence of co-occurring inorganic solutes. Comparison of coagulation and adsorption experiments and of experimental results with predictions based on surface complexation modeling demonstrated that adsorption is an important (though not the sole) mechanism governing arsenic removal during coagulation. Under comparable conditions, better removal was observed with arsenic (V) [As(V)] than with arsenic(III) [As(III)] in both coagulation and adsorption experiments. Below neutral pH values, As(III) removal-adsorption was significantly decreased in the presence of sulfate, whereas only a slight decrease in As(V) removal-adsorption was observed. At high pH, removal-adsorption of As(V) was increased in the presence of calcium. Removal of As(V) during coagulation with ferric chloride is both more efficient and less sensitive than that of As(III) to variations in source water composition. Includes 34 references, tables, figures.