研究了三氯化铁常规混凝去除水中天然溶解有机物（DOM）的效果。反渗透被用来从佐治亚州南部的苏万尼河和佐治亚州西北部的阿拉图纳湖分离DOM。水源水之间最显著的两个差异是pH值和有机碳浓度。广泛的罐试验根据DOM的初始浓度、混凝剂用量和pH条件确定了去除区域。用快原子轰击质谱对分子结构进行了表征- 凝固前后DOM的重量分布。质谱形状的趋势与DOM去除的数据很好地相关，并表明DOM去除的机理随pH值和混凝剂剂量而变化。在较高的pH值条件和较低的混凝剂剂量下，在混凝后的质谱中检测到高达1000道尔顿（D）的质量。在较低的pH条件和较高的混凝剂剂量下，质谱图中没有超过750 D的质量。包括36个参考文献、表格、图表。

Removal of natural aquatic dissolved organic matter (DOM) by conventional coagulation using ferric chloride was investigated. Reverse osmosis was used to isolate DOM from the Suwannee River in southern Georgia and from Lake Allatoona in northwestern Georgia. The two most significant differences between the source waters are pH and organic carbon concentration. Extensive jar-testing identified regions of removal based on initial concentration of DOM, coagulant dosage, and pH conditions. Fast atom bombardment mass spectrometry was used to characterize the molecular-weight distributions of DOM before and after coagulation. Trends in the shape of the mass spectra correlated well with data for DOM removal and suggested that the mechanism for DOM removal varies with the pH and coagulant dosage. At higher pH conditions and lower coagulant dosages, masses up to 1,000 daltons (D) were detected in the mass spectra after coagulation. At lower pH conditions and higher coagulant dosages, no masses above 750 D appeared in the mass spectra. Includes 36 references, tables, figures.