Wei Qunshan, Wang Dongsheng, Wei Qia, Qiao Chunguang, Shi Baoyou, Tang Hongxiao
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Environ Monit Assess. 2008 Jun;141(1-3):347-57. doi: 10.1007/s10661-007-9901-1. Epub 2007 Sep 13.
Dissolved organic matter (DOM) and its potential to form disinfection by-products (DBPs) during drinking water treatment raise challenges to water quality control. Understanding both chemical and physical characteristics of DOM in source waters is key to better water treatment. In this study, the DOM from four typical source waters in China was fractionated by XAD resin adsorption (RA) and ultrafiltration (UF) techniques. The trihalomethane formation potential (THMFP) of all fractions in the DOM were investigated to reveal the major THM precursors. The fraction distributions of DOM could be related to their geographical origins in a certain extent. The dominant chemical fraction as THM precursors in the DOM from south waters (East-Lake reservoir in Shenzhen and Peal rivers in Guangzhou) was hydrophobic acid (HoA). The size fraction with molecular weight (MW) <1 kDa in both south waters had the highest THMFP. The results of cluster analysis showed that the parameters of fractions including DOC percentage (DOC%), UV254%, SUVA254 (specific UV254 absorbance) and THMFP were better for representing the differences of DOM from the studied waters than specific THMFP (STHMFP). The weak correlation between SUVA254 and STHMFP for either size or XAD fractions suggests that whether SUVA254 can be used as an indicator for the reactivity of THM formation is highly dependent on the nature of organic matter.
溶解有机物（DOM）及其在饮用水处理过程中形成消毒副产物（DBPs）的可能性给水质控制带来了挑战。了解源水中DOM的化学和物理特性是实现更好水处理的关键。在本研究中，采用XAD树脂吸附（RA）和超滤（UF）技术对中国四种典型源水的DOM进行了分级。研究了DOM中各组分的三卤甲烷生成势（THMFP），以揭示主要的THM前体物质。DOM的组分分布在一定程度上与其地理来源有关。南方水源（深圳东湖水库和广州珠江）DOM中作为THM前体的主要化学组分是疏水酸（HoA）。南方两种水源中分子量（MW）<1 kDa的粒径组分具有最高的THMFP。聚类分析结果表明，包括DOC百分比（DOC%）、UV254%、SUVA254（比UV254吸光度）和THMFP在内的组分参数比特定THMFP（STHMFP）更能代表所研究水体中DOM的差异。对于粒径或XAD组分，SUVA254与STHMFP之间的弱相关性表明，SUVA254是否可作为THM形成反应性的指标高度依赖于有机物的性质。
