Fan Zihong, Gong Song, Xu Xuan, Zhang Xiaohu, Zhang Ying, Yu Xin
School of Environmental and Biological engineering, Chongqing Technology and Business University, Chongqing 400067, China; Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
Int J Hyg Environ Health. 2014 Mar;217(2-3):300-6. doi: 10.1016/j.ijheh.2013.07.002. Epub 2013 Jul 8.
Dissolved organic matters (DOM) are critical in the formation of the mutagenic disinfection byproducts (DBPs). In this study, five DOM fractions were isolated and investigated from a contaminated river and a clean reservoir source waters using resin adsorption. The DOM fractions were characterized with excitation-emission matrix, and several typical DBPs formation potentials and the mutagenicity of each DOM fraction were measured. Among these fractions, hydrophobic neutrals (HON), hydrophilic acids (HIA) and hydrophilic bases (HIB) generated the highest carbon-containing DBPs in the river source water, as did HIB and hydrophobic bases (HOB) in reservoir water. Hydrophobic acids (HOA), HON, and HIA were the three most important fractions forming nitrogen-containing DBPs. Following chlorination, the mutagenicity of HON, HIA, HOA and HIB was 1503, 626, 422 and 116 ng 4-NQO/mg DOC in river water, respectively. Only HIA and HOA were mutagenic with 85 and 10 ng 4-NQO/mg DOC in reservoir water, respectively. The soluble microbial products like substances and aromatic proteins contributed significantly to the mutagenicity of river water; whereas the humic acid-like and fulvic acid-like substances were the primary contributors to the mutagenicity of reservoir water.
溶解有机物（DOM）在致突变消毒副产物（DBP）的形成中至关重要。在本研究中，使用树脂吸附从一条受污染河流和一个清洁水库水源水中分离并研究了五种DOM组分。通过激发-发射矩阵对DOM组分进行了表征，并测定了几种典型DBP的生成潜力以及各DOM组分的致突变性。在这些组分中，疏水中性物（HON）、亲水性酸（HIA）和亲水性碱（HIB）在河流源水中产生的含碳DBP最多，水库水中的HIB和疏水性碱（HOB）也是如此。疏水性酸（HOA）、HON和HIA是形成含氮DBP的三个最重要的组分。氯化后，河水中HON、HIA、HOA和HIB的致突变性分别为1503、626、422和116 ng 4-NQO/mg DOC。在水库水中，只有HIA和HOA具有致突变性，分别为85和10 ng 4-NQO/mg DOC。可溶性微生物产物类物质和芳香族蛋白质对河水的致突变性有显著贡献；而类腐殖酸和类富里酸物质是水库水致突变性的主要贡献者。
