Department of Analytical Chemistry, Campus of Rabanales, University of Córdoba, E-14071 Córdoba, Spain.
Department of Physical and Analytical Chemistry, E.P.S. of Linares, University of Jaén, E-23700 Linares, Jaén, Spain.
Water Res. 2014 Mar 15;51:186-97. doi: 10.1016/j.watres.2013.10.059. Epub 2013 Nov 5.
The occurrence of 35 aliphatic and aromatic carboxylic acids within two full scale drinking-water treatment plants was evaluated for the first time in this research. At the intake of each plant (raw water), the occurrence of carboxylic acids varied according to the quality of the water source although in both cases 13 acids were detected at average concentrations of 6.9 and 4.7 μg/L (in winter). In the following steps in each treatment plant, the concentration patterns of these compounds differed depending on the type of disinfectant applied. Thus, after disinfection by chloramination, the levels of the acids remained almost constant (average concentration, 6.3 μg/L) and four new acids were formed (butyric, 2-methylbutyric, 3-hydroxybenzoic and 2-nitrobenzoic) at low levels (1.1-5 μg/L). When ozonation/chlorination was used, the total concentration of the carboxylic acids in the raw water sample (4.7 μg/L) increased up to 6 times (average concentration, 26.3 μg/L) after disinfection and 6 new acids (mainly aromatic) were produced at high levels (3.5-100 μg/L). Seasonal variations of the carboxylic acids under study showed that in both plants, maximum levels of all the analytes were reached in the coldest months (autumn and winter), aromatic acids only being found in those seasons.
本研究首次评估了两座全规模饮用水处理厂中 35 种脂肪族和芳香族羧酸的存在情况。在每个工厂（原水）的进水口，尽管在两种情况下均检测到 13 种酸，但由于水源水质的不同，羧酸的存在情况也有所不同，平均浓度分别为 6.9 和 4.7μg/L（冬季）。在每个处理厂的后续步骤中，这些化合物的浓度模式因应用的消毒剂类型而异。因此，经过氯胺消毒后，这些酸的水平几乎保持不变（平均浓度为 6.3μg/L），同时形成了四种新的酸（丁酸、2-甲基丁酸、3-羟基苯甲酸和 2-硝基苯甲酸），浓度较低（1.1-5μg/L）。当使用臭氧/氯化消毒时，原水中羧酸的总浓度（4.7μg/L）在消毒后增加了 6 倍（平均浓度为 26.3μg/L），并产生了 6 种新的酸（主要是芳香族酸），浓度较高（3.5-100μg/L）。研究中羧酸的季节性变化表明，在两个工厂中，所有分析物的最高水平均出现在最冷的月份（秋季和冬季），仅在这些季节才发现芳香族酸。
