Wei Qun-shan, Feng Cheng-hong, Wang Dong-sheng, Shi Bao-you, Zhang Li-tian, Wei Qia, Tang Hong-xiao
State Key Lab of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
J Hazard Mater. 2008 Jan 31;150(2):257-64. doi: 10.1016/j.jhazmat.2007.04.096. Epub 2007 Apr 24.
Dissolved organic matter (DOM) and its potential to form disinfection by-products (DBPs) during water treatment are of great public health concern. Understanding the seasonal changes in DOM composition and their reactivity in DBP formation could lead to a better treatment of drinking water and a more consistent water quality. DOM from the East-Lake, a reservoir in the south-China, was fractionated and characterized by XAD resin adsorption (RA) and ultrafiltration (UF) techniques during different seasons within a year. The properties of chemical fractions (isolated by RA) appeared more stable than those of physical fractions (separated by UF) throughout the sampling period. The relative contribution of each chemical fraction to the total dissolved organic carbon (DOC), UV(254) absorbance and trihalomethane formation potential (THMFP) remained relatively constant across the sampling period. However, the physical (molecular weight) fractions of the DOM exhibited large seasonal changes in UV(254) and THMFP. Compared to the parameter of DOC, the THMFP and specific THMFP (STHMFP) of either chemical or physical fractions were more variable. In terms of DOC concentration, the hydrophobic acids (HoA) and hydrophilic matter (HiM) dominated in the DOM in most of the seasons; while the components with molecular weight of 10-30 kDa and less than 1 kDa were the predominant physical fractions.
溶解有机物（DOM）及其在水处理过程中形成消毒副产物（DBPs）的可能性备受公众健康关注。了解DOM组成的季节性变化及其在DBP形成中的反应性，有助于更好地处理饮用水并使水质更稳定。中国南方一座水库——东湖的DOM在一年中的不同季节通过XAD树脂吸附（RA）和超滤（UF）技术进行了分离和表征。在整个采样期间，化学组分（通过RA分离）的性质似乎比物理组分（通过UF分离）更稳定。在整个采样期间，每个化学组分对总溶解有机碳（DOC）、UV(254)吸光度和三卤甲烷生成潜力（THMFP）的相对贡献保持相对恒定。然而，DOM的物理（分子量）组分在UV(254)和THMFP方面表现出较大的季节性变化。与DOC参数相比，化学或物理组分的THMFP和比THMFP（STHMFP）变化更大。就DOC浓度而言，在大多数季节中，疏水性酸（HoA）和亲水性物质（HiM）在DOM中占主导；而分子量为10 - 30 kDa和小于1 kDa的组分是主要的物理组分。
