本研究的目的是描述 评估水系统中消毒副产物（DBP）的反应性分布 改性有机物（MOM）反应性的停留时间。本文讨论了魁北克市（加拿大）供水系统的案例研究。四次抽样 选择了一些点进行数据收集。第一个位于后氯化之前 在工厂内部。这一点提供了有关MOM初始条件的信息。 其他三个点位于配水管道沿线，即在开始时 中间和末端，水的停留时间约为3、12和15 分别是小时。这些点的位置允许评估 DBP形成的停留时间和管道中MOM的变化。 在每个点进行了四次抽样活动。为了表征MOM反应性，样品首先通过反向浓缩 渗透，直到体积浓度系数达到10。污染有机物 通过碱性溶液清洗回收膜上的残余物。这个 滞留物和碱性溶液被视为两种不同的组分。 一部分 用两种非离子大孔树脂对残余物进行分级。为分馏开发的方法受到了启发 从L.Labouyrie Rouiller使用的方法和有机物的吸附 此事是按照制造商的建议进行的。通过分馏产物的实验氯化试验研究了MOM反应性 以及在pH、温度和温度受控条件下的非分馏样品 氯气剂量。测量 pH值、电导率、浊度、总有机碳（TOC）、紫外线吸收率和温度 对采集的所有样品和生产的所有馏分进行了测试。 包括14个参考文献、图表。

The objective of this study was to characterize the reactivity of disinfection byproduct (DBP) precursors occurring in a water distribution system (DS) and to evaluate the global effect of residence time on modified organic matter (MOM) reactivity. The paper discusses a case study of Quebec City's (Canada) water utility distribution system. Four sampling points were selected for data collection. The first was located before post-chlorination within the plant. This point provided information about the initial conditions of MOM. The three other points were located along distribution pipes, i.e. at the beginning, the middle and the extremity, with approximate residence times of water of 3, 12 and 15 hours, respectively. The location of these points allowed evaluation of the impact of residence time on the formation of DBPs and changes in MOM throughout the pipes. Four sampling campaigns were conducted at each point. In order to characterize MOM reactivity, samples were first concentrated by reverse osmosis until a volume concentration factor of 10 was reached. Fouling organic matter remaining on the membrane was recovered by an alkaline solution wash. The retentate and the alkaline solution were considered as two distinct fractions. A portion of the retentate was fractionated with two non-ionic macroporous resins. The methodology developed for the fractionation was inspired from the method used by L. Labouyrie-Rouiller and the adsorption of the organic matter was conducted following manufacturer recommendations. MOM reactivity was investigated using experimental chlorination tests on fractionated and non-fractionated samples under controlled conditions of pH, temperature and chlorine dose. Measurements of pH, conductivity, turbidity, total organic carbon (TOC), UV-absorbance and temperature were carried out for all samples collected and all produced fractions. Includes 14 references, figures.