臭氧氧化可能会改变饮用水处理重要反应中天然有机物（NOM）的官能团组成、分子量（MW）和行为。在这项工作中，通过酸碱滴定、离子色谱和凝胶渗透色谱（GPC）监测臭氧对NOM的转化。这些结果使人们更好地理解了臭氧氧化如何影响NOM，以及臭氧氧化NOM如何影响新沉淀的氢氧化铁和氢氧化铝的溶解性。臭氧氧化过程中有机酸显著增加，大多数新生成的有机酸基团在pH值为4时电离。 0.在臭氧氧化NOM中测定的27种简单有机酸中，草酸占主导地位。臭氧氧化产生的草酸浓度随着臭氧剂量、溶液pH和Fe（II）浓度的增加而增加。臭氧氧化NOM破坏了GPC测定的高和低表观分子量化合物，并增加了中等表观分子量化合物的浓度。然而，在具有中等表观分子量的化合物组中，主要可识别化合物是低分子量有机酸，如草酸和甲酸。根据这一点和其他观察结果，臭氧氧化导致的NOM色谱图变化似乎更能反映分子官能团组成和极性的变化- -而真正的MW变化比之前认识到的要小。在相对较高的臭氧剂量和微酸性pH值下，NOM臭氧氧化产生的草酸可以络合并溶解显著浓度的铝。考虑到草酸是此类体系中唯一的金属络合配体，可以合理地预测臭氧氧化NOM存在时形成的可溶性金属浓度。包括40个参考文献、表格和图表。

Ozonation may alter the functional group composition, molecular weight (MW), and behavior of natural organic matter (NOM) in reactions of significance for drinking water treatment. In this work, the transformation of NOM by ozone was monitored by acid-base titrations, ion chromatography, and gel-permeation chromatography (GPC). The results led to an improved understanding of how ozonation affects NOM and how ozonated NOM affects the solubility of freshly precipitated iron and aluminum hydroxides. Organic acidity increased substantially during ozonation, and most of the newly produced organic acid groups were ionized at pH 4.0. Of 27 simple organic acids assayed in ozonated NOM, oxalic acid was dominant. The concentration of oxalate produced upon ozonation increased with ozone dose, solution pH, and Fe(II) concentration. Ozonation of NOM destroyed compounds of high and low apparent MW as determined by GPC and increased the concentration of compounds with intermediate apparent MW. Within the group of compounds formed with intermediate apparent MW, however, the dominant identifiable compounds were low-MW organic acids such as oxalic and formic acids. Based on this and other observations, changes in the chromatograms of NOM as a result of ozonation appear to reflect changes in functional group composition and polarity of the molecules more--and true MW changes less--than previously recognized. At relatively high ozone doses and slightly acidic pH values, oxalic acid produced upon ozonation of NOM can complex and solubilize significant concentrations of aluminum. The concentration of soluble metal that formed in the presence of ozonated NOM can be predicted reasonably well by considering oxalate as the only metal-complexing ligand present in such systems. Includes 40 references, tables, figures.